[maven-release-plugin] prepare release common-1.2.1

git-svn-id: https://source.sakaiproject.org/svn/common/branches/common-1.2.x@119639 66ffb92e-73f9-0310-93c1-f5514f145a0a
[maven-release-plugin] prepare for next development iteration

git-svn-id: https://source.sakaiproject.org/svn/common/branches/common-1.2.x@119641 66ffb92e-73f9-0310-93c1-f5514f145a0a