[MNG-2318] Fixing parent id() method to match format from model id method, so relative-path POMs can be validated for correct info.
[MNG-2318] Fixing parent id() method to match format from model id method, so relative-path POMs can be validated for correct info.

git-svn-id: 2c527eb49caa05e19d6b2be874bf74fa9d7ea670@672839 13f79535-47bb-0310-9956-ffa450edef68

pkozelka/maven,njuneau/maven,barthel/maven,stephenc/maven,lbndev/maven,wangyuesong/maven,changbai1980/maven,mizdebsk/maven,cstamas/maven,Tibor17/maven,stephenc/maven,mizdebsk/maven,karthikjaps/maven,rogerchina/maven,apache/maven,skitt/maven,kidaa/maven-1,njuneau/maven,olamy/maven,stephenc/maven,trajano/maven,mcculls/maven,keith-turner/maven,changbai1980/maven,skitt/maven,vedmishr/demo1,aheritier/maven,barthel/maven,rogerchina/maven,Tibor17/maven,olamy/maven,aheritier/maven,runepeter/maven-deploy-plugin-2.8.1,likaiwalkman/maven,vedmishr/demo1,josephw/maven,gorcz/maven,gorcz/maven,atanasenko/maven,dsyer/maven,dsyer/maven,Mounika-Chirukuri/maven,aheritier/maven,karthikjaps/maven,pkozelka/maven,apache/maven,mizdebsk/maven,kidaa/maven-1,wangyuesong0/maven,xasx/maven,xasx/maven,atanasenko/maven,dsyer/maven,lbndev/maven,lbndev/maven,skitt/maven,Distrotech/maven,wangyuesong0/maven,likaiwalkman/maven,olamy/maven,xasx/maven,Distrotech/maven,josephw/maven,vedmishr/demo1,wangyuesong/maven,josephw/maven,rogerchina/maven,karthikjaps/maven,Mounika-Chirukuri/maven,ChristianSchulte/maven,apache/maven,Mounika-Chirukuri/maven,cstamas/maven,trajano/maven,gorcz/maven,wangyuesong/maven,keith-turner/maven,mcculls/maven,keith-turner/maven,ChristianSchulte/maven,pkozelka/maven,njuneau/maven,atanasenko/maven,barthel/maven,ChristianSchulte/maven,cstamas/maven,wangyuesong0/maven,trajano/maven,changbai1980/maven,runepeter/maven-deploy-plugin-2.8.1,kidaa/maven-1,likaiwalkman/maven,mcculls/maven