no way to delete valid/invalid security rule

Previously deleting valid/invalid security
group rules was throwing the error of
"AttributeError". With this fix, now both
types of security group rules can be deleted.

Change-Id: I253c2742efe69ee41976c88ca2775189bc5bde0d
Closes-Bug: #1163469
Add missing parameters for server rescue

The server rescue call supports passing a password and an image,
however novaclient does not have options to support this. This commit
adds these options and updates the related unit tests to support the
change.

Change-Id: I14c878c0027f8206671ee001ba5195f94f842314
Merge "Add missing parameters for server rescue"