ReqMgr2 package and modules naming

-making happy all WMCore consistency of naming
    guardians: CamelCase for package and module names
-static content dir is ReqMgr
-test/data - ReqMgr, shared with ReqMgr1
-no 2 names in a directory differ only in case since MacOS+git
    can't apparently handle that properly (!)
Merge pull request #4633 from zdenekmaxa/reqmgr2-renaming-modules-packages

ReqMgr2 package and modules naming