When using command alarm-gnocchi-* the project_id and user_id are not
set. The patch fix it and add related tests:
1.ceilometer gnocchi alarm create/update test cases
2.check gnocchi alarm create/update command args test cases
3.check update alarm without alarm-id
4.check shadowed args are restored
Closes-Bug: #1506509
Change-Id: If6a8cfd9bc52b3eeff99dfcfdee2f4da7220674b