GS-9058 rename MAVEN_HOME to M2_HOME
GS-9058
rename MAVEN_HOME to M2_HOME

svn path=/trunk/gigaspaces/; revision=91030


Former-commit-id: 14fd76e5194d382ba37661a7f5dff26085aa1699
Gigaspaces/xap-openspaces,Gigaspaces/xap-openspaces,Gigaspaces/xap-openspaces