Addd batch executable build env for DSL

Author: nbhoski

src/main/java/com/mathworks/ci/MatlabInstallation.java

@@ -58,6 +58,7 @@ public MatlabInstallation forNode(@Nonnull Node node, TaskListener log) throws I
     @Override
     public void buildEnvVars(EnvVars env) {
         String pathToExecutable = getHome() + "/bin";
+        env.put ("PATH+matlab_batch", getHome ());
         env.put("PATH+matlabroot", pathToExecutable);
     }
 

src/main/java/com/mathworks/ci/tools/MatlabInstaller.java

@@ -74,6 +74,7 @@ public FilePath performInstallation (ToolInstallation tool, Node node, TaskListe
         } catch (Exception e) {
             throw new InstallationFailedException (e.getMessage ());
         }
+
         getFreshCopyOfExecutables (installable, expectedPath);
 
         int result = installUsingMpm (node, expectedPath, log);