Update the gitingore
Update the gitingore

Updating the gitingore files for *.swp, egg and coverage files.

Change-Id: I5349a2c16e5f286a9131a4d9bd356f837d8a8680

StackStorm/python-mistralclient,StackStorm/python-mistralclient,openstack/python-mistralclient,openstack/python-mistralclient