AMBARI-20198. [UT parallel tests] ambari maven execution needs external variable for forkcount in docker image. (mpapirkovskyy)

ambari-project/pom.xml

@@ -32,6 +32,8 @@
     <jetty.version>8.1.19.v20160209</jetty.version>
     <checkstyle.version>6.19</checkstyle.version> <!-- last version that does not require Java 8 -->
     <checkstyle.skip>false</checkstyle.skip>
+    <forkCount>4</forkCount>
+    <reuseForks>false</reuseForks>
   </properties>
   <profiles>
     <profile>
@@ -551,10 +553,10 @@
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-surefire-plugin</artifactId>
         <configuration>
+          <reuseForks>${reuseForks}</reuseForks>
+          <forkCount>${forkCount}</forkCount>
           <redirectTestOutputToFile>true</redirectTestOutputToFile>
           <forkedProcessTimeoutInSeconds>900</forkedProcessTimeoutInSeconds>
-          <reuseForks>false</reuseForks>
-          <forkCount>1C</forkCount>
         </configuration>
       </plugin>
       <plugin>