Delete stale build tool files from kubernetes module.

Author: jglick

kubernetes/.gitignore

@@ -8,14 +8,9 @@
 *.war
 *.ear
 
-# exclude jar for gradle wrapper
-!gradle/wrapper/*.jar
-
 # virtual machine crash logs, see http://www.java.com/en/download/help/error_hotspot.xml
 hs_err_pid*
 
 # build files
 **/target
 target
-.gradle
-build