make check: do not run as root.

git-svn-id: svn://svn.code.sf.net/p/dmtcp/code/trunk@2805 ba6dc0ae-232f-0410-883f-9ebac64fc565
Bumping version to 2.3

git-svn-id: svn://svn.code.sf.net/p/dmtcp/code/trunk@2806 ba6dc0ae-232f-0410-883f-9ebac64fc565