pcs_constraint_ticket implementation

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Implement creating/updating/deleting constraints with ticket.
Matching criteria: same ticket_name, role, resource ID
Non-matching criteria (for update): loss-policy

Expected to be based on following 2 commands from pcs:

ticket add <ticket> [<role>] <resource id> [<options>]
           [id=<constraint-id>]
    Create a ticket constraint for <resource id>.
    Available option is loss-policy=fence/stop/freeze/demote.
    A role can be master, slave, started or stopped.

ticket remove <ticket> <resource id>
    Remove all ticket constraints with <ticket> from <resource id>.

If interested in developing this, get in touch first to prevent duplication of work. If you have questions feel free to ask.