HBASE-16242 Manually resolve transitive Apache Avro dependency to consistently be ver 1.7.7.

Signed-off-by: Jerry He <jerryjch@apache.org>

hbase-common/pom.xml

@@ -262,6 +262,11 @@
       <groupId>org.apache.commons</groupId>
       <artifactId>commons-crypto</artifactId>
     </dependency>
+    <!-- transitive coalescing -->
+    <dependency>
+      <groupId>org.apache.avro</groupId>
+      <artifactId>avro</artifactId>
+    </dependency>
   </dependencies>
 
   <profiles>

hbase-spark/pom.xml

@@ -41,8 +41,6 @@
         <scala.version>2.10.4</scala.version>
         <scala.binary.version>2.10</scala.binary.version>
         <top.dir>${project.basedir}/..</top.dir>
-        <avro.version>1.7.6</avro.version>
-        <avro.mapred.classifier></avro.mapred.classifier>
     </properties>
 
     <dependencies>
@@ -526,7 +524,6 @@
         <dependency>
           <groupId>org.apache.avro</groupId>
           <artifactId>avro</artifactId>
-          <version>${avro.version}</version>
         </dependency>
     </dependencies>
 

pom.xml

@@ -1238,6 +1238,7 @@
     <compat.module>hbase-hadoop2-compat</compat.module>
     <assembly.file>src/main/assembly/hadoop-two-compat.xml</assembly.file>
     <!-- end HBASE-15925 default hadoop compatibility values -->
+    <avro.version>1.7.7</avro.version>
     <commons-cli.version>1.4</commons-cli.version>
     <commons-codec.version>1.9</commons-codec.version>
     <!-- pretty outdated -->
@@ -1558,6 +1559,12 @@
         <artifactId>log4j</artifactId>
         <version>${log4j.version}</version>
       </dependency>
+      <!-- Avro dependencies we mostly get transitively, manual version coallescing -->
+      <dependency>
+        <groupId>org.apache.avro</groupId>
+        <artifactId>avro</artifactId>
+        <version>${avro.version}</version>
+      </dependency>
       <!--This is not used by hbase directly.  Used by thrift,
           dropwizard and zk.-->
       <dependency>