JFG-845 Add stack trace logging for errors (#37)

* + add stackTrace to log on exception
+ add quotes to script file while chmod command

* revert error message back

Author: amikryukov

src/main/java/com/griddynamics/jagger/jenkins/plugin/JaggerEasyDeployPlugin.java

@@ -728,8 +728,9 @@ public boolean perform(AbstractBuild<?, ?> build, Launcher launcher, BuildListen
             }
         } catch (Exception e) {
 
-            logger.println("!!!" + getLineSeparator() + "Exception in perform " + e +
-                    "can't create script file or run script");
+            logger.println("!!!" + getLineSeparator() + "Exception in perform(): " + e +
+                    "\nCan't create script file or run script");
+            e.printStackTrace(logger);
             try {
                 pathToDeploymentScript.delete();
                 logger.println(pathToDeploymentScript + " has been deleted");
@@ -763,7 +764,7 @@ private void createScriptFile(FilePath file) throws Exception {
         }
 
         //setting permissions for executing
-        procStarter.cmds(stringToCmds("chmod +x " + file)).start();
+        procStarter.cmds(stringToCmds("chmod +x '" + file + "'")).start();
     }