Remove prelert_ prefix from programs to fit what Elasticsearch expects (elastic/elasticsearch#332)

Elasticsearch will now attempt to spawn a controller daemon called simply
`controller` when it starts up, but ours was called `prelert_controller`.
For consistency it makes sense to remove the prefix from all our programs.

Original commit: elastic/x-pack-elasticsearch@d06714b231

elasticsearch/src/main/java/org/elasticsearch/xpack/prelert/job/process/ProcessCtrl.java

@@ -37,19 +37,19 @@ public class ProcessCtrl {
     /**
      * Autodetect API native program name - always loaded from the same directory as the controller process
      */
-    public static final String AUTODETECT = "prelert_autodetect";
+    public static final String AUTODETECT = "autodetect";
     static final String AUTODETECT_PATH = "./" + AUTODETECT;
 
     /**
      * The normalisation native program name - always loaded from the same directory as the controller process
      */
-    public static final String NORMALIZE = "prelert_normalize";
+    public static final String NORMALIZE = "normalize";
     static final String NORMALIZE_PATH = "./" + NORMALIZE;
 
     /**
      * Process controller native program name
      */
-    public static final String CONTROLLER = "prelert_controller";
+    public static final String CONTROLLER = "controller";
 
     /**
      * Name of the config setting containing the path to the logs directory
@@ -73,7 +73,7 @@ public class ProcessCtrl {
     static final String LICENSE_VALIDATION_ARG = "--licenseValidation=";
 
     /*
-     * Arguments used by both prelert_autodetect and prelert_normalize
+     * Arguments used by both autodetect and normalize
      */
     static final String BUCKET_SPAN_ARG = "--bucketspan=";
     public static final String DELETE_STATE_FILES_ARG = "--deleteStateFiles";
@@ -85,7 +85,7 @@ public class ProcessCtrl {
     static final String PER_PARTITION_NORMALIZATION = "--perPartitionNormalization";
 
     /*
-     * Arguments used by prelert_autodetect
+     * Arguments used by autodetect
      */
     static final String BATCH_SPAN_ARG = "--batchspan=";
     static final String LATENCY_ARG = "--latency=";

elasticsearch/src/main/java/org/elasticsearch/xpack/prelert/job/process/ProcessPipes.java

@@ -69,9 +69,9 @@ public class ProcessPipes {
                         boolean wantRestorePipe, boolean wantPersistPipe) {
         this.namedPipeHelper = namedPipeHelper;
 
-        // The way the pipe names are formed MUST match what is done in the prelert_controller main()
+        // The way the pipe names are formed MUST match what is done in the controller main()
         // function, as it does not get any command line arguments when started as a daemon.  If
-        // you change the code here then you MUST also change the C++ code in prelert_controller's
+        // you change the code here then you MUST also change the C++ code in controller's
         // main() function.
         StringBuilder prefixBuilder = new StringBuilder();
         prefixBuilder.append(namedPipeHelper.getDefaultPipeDirectoryPrefix(env)).append(Objects.requireNonNull(processName)).append('_');

elasticsearch/src/main/java/org/elasticsearch/xpack/prelert/job/process/autodetect/writer/FieldConfigWriter.java

@@ -35,8 +35,7 @@ public class FieldConfigWriter {
     private static final String LIST_PREFIX = "list.";
 
     // Note: for the Engine API summarycountfield is currently passed as a
-    // command line option to prelert_autodetect rather than in the field
-    // config file
+    // command line option to autodetect rather than in the field config file
 
     private static final char NEW_LINE = '\n';
 

elasticsearch/src/test/java/org/elasticsearch/xpack/prelert/job/logging/CppLogMessageHandlerTests.java

@@ -24,10 +24,10 @@ public class CppLogMessageHandlerTests extends ESTestCase {
                 + "\"method\":\"core::CLogger::reconfigureFromProps\",\"file\":\"CLogger.cc\",\"line\":452}\n"
                 + "{\"logger\":\"controller\",\"timestamp\":1478261151445,\"level\":\"DEBUG\",\"pid\":10211,\"thread\":\"0x7fff7d2a8000\","
                 + "\"message\":\"Logger is logging to named pipe "
-                + "/var/folders/k5/5sqcdlps5sg3cvlp783gcz740000h0/T/prelert_controller_log_784\",\"class\":\"prelert\","
+                + "/var/folders/k5/5sqcdlps5sg3cvlp783gcz740000h0/T/controller_log_784\",\"class\":\"prelert\","
                 + "\"method\":\"core::CLogger::reconfigureLogToNamedPipe\",\"file\":\"CLogger.cc\",\"line\":333}\n"
                 + "{\"logger\":\"controller\",\"timestamp\":1478261151445,\"level\":\"INFO\",\"pid\":10211,\"thread\":\"0x7fff7d2a8000\","
-                + "\"message\":\"prelert_controller (64 bit): Version based on 6.5.0 (Build DEVELOPMENT BUILD by dave) "
+                + "\"message\":\"controller (64 bit): Version based on 6.5.0 (Build DEVELOPMENT BUILD by dave) "
                 + "Copyright (c) Prelert Ltd 2006-2016\",\"method\":\"main\",\"file\":\"Main.cc\",\"line\":123}\n"
                 + "{\"logger\":\"controller\",\"timestamp\":1478261169065,\"level\":\"ERROR\",\"pid\":10211,\"thread\":\"0x7fff7d2a8000\","
                 + "\"message\":\"Did not understand verb 'a'\",\"class\":\"prelert\","