Test: increase number of script compilations per minute to 20

This commit increases the number of script compilations per minute to 20 to account for security
and watcher upgrade scripts in addition to the scripts contained within cluster alerts.

Relates elastic/x-pack-elasticsearch#2041

Original commit: elastic/x-pack-elasticsearch@6c15cb9b89

qa/full-cluster-restart/build.gradle

@@ -121,6 +121,7 @@ subprojects {
       setting 'xpack.security.transport.ssl.enabled', 'true'
       setting 'xpack.ssl.keystore.path', 'testnode.jks'
       setting 'xpack.ssl.keystore.password', 'testnode'
+      setting 'script.max_compilations_per_minute', '20'
       dependsOn copyTestNodeKeystore
       extraConfigFile 'testnode.jks', new File(outputDir + '/testnode.jks')
       if (withSystemKey) {
@@ -154,6 +155,7 @@ subprojects {
       setupCommand 'setupTestUser', 'bin/x-pack/users', 'useradd', 'test_user', '-p', 'x-pack-test-password', '-r', 'superuser'
       waitCondition = waitWithAuth
       setting 'xpack.ssl.keystore.path', 'testnode.jks'
+      setting 'script.max_compilations_per_minute', '20'
       keystoreSetting 'xpack.ssl.keystore.secure_password', 'testnode'
       dependsOn copyTestNodeKeystore
       extraConfigFile 'testnode.jks', new File(outputDir + '/testnode.jks')