ovirt-config-password: make it more convenient to be used

rename "ovirt-config-password" into "ovirt-node-config-password" and keep it
in /usr/bin. Also keep a symlink called ovirt-config-password in /usr/libexec
for backwards compatability.

Change-Id: I5c333152d1d5b1395341d63e89ff8d3598fe38b0
Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=1118965
Signed-off-by: hadong <hadong@redhat.com>