cman: drastically improve startup errors
cman: drastically improve startup errors

cman_tool join has a nasty habit of just exiting with
"corosync failed to start" or some such unhelpful error message.

This patch improves on these by trapping the corosync exit code and
attempting to interpret it for the user.

Signed-off-by: Christine Caulfield <992cedbe1eac7dbaff482fcb880a50b57e6b8062@redhat.com>

stevenraspudic/resource-agents,stevenraspudic/resource-agents,stevenraspudic/resource-agents,asp24/resource-agents,asp24/resource-agents,asp24/resource-agents