UP-4142 Group import changes

https://issues.jasig.org/browse/UP-4142
https://issues.jasig.org/browse/UP-4159
https://issues.jasig.org/browse/UP-4160

Changed crn script for group and group membership import to allow changes to group membership to update caches.

To do (do not hold up pull request processing for this):
* Test in clustered uPortal situation to verify imports on one node clear caches on other nodes
* Test if ant import-data will flush caches on uPortal nodes (optional but desirable)
The variable ENTITY_TYPE isn't defined here...

Caused by: groovy.lang.MissingPropertyException: No such property: ENTITY_TYPE for class: Script14
	at org.codehaus.groovy.runtime.ScriptBytecodeAdapter.unwrap(ScriptBytecodeAdapter.java:50)
	at org.codehaus.groovy.runtime.callsite.PogoGetPropertySite.getProperty(PogoGetPropertySite.java:49)
	at org.codehaus.groovy.runtime.callsite.AbstractCallSite.callGroovyObjectGetProperty(AbstractCallSite.java:231)
	at Script14.run(Script14.groovy:24)
	at org.codehaus.groovy.jsr223.GroovyScriptEngineImpl.eval(GroovyScriptEngineImpl.java:345)
	... 86 more