YARN-10407. Add phantomjsdriver.log to gitignore. (#2244)

(cherry picked from commit 658b1a6cde6834be41de8745684b9c40f8b9c12c)

 Conflicts:
	.gitignore

.gitignore

@@ -51,6 +51,7 @@ patchprocess/
 .history/
 hadoop-yarn-project/hadoop-yarn/hadoop-yarn-ui/src/main/webapp/package-lock.json
 hadoop-yarn-project/hadoop-yarn/hadoop-yarn-ui/src/main/webapp/yarn-error.log
+phantomjsdriver.log
 
 #robotframework outputs
 log.html