Removes the external dependency from the gmi to the global variable
this_ip. This is still passed in for gmi_init users to be notified
of which IP was selected, but copied for local use.

BKrev: 40ef692cfv-e5JCQ8T9iC-_i3AaBcg


git-svn-id: http://svn.fedorahosted.org/svn/corosync/trunk@92 fd59a12c-fef9-0310-b244-a6a79926bd2f