Error messages for failing floating IP association

Add more informative error message when trying to
associate a 2nd floating IP to an instance

Change-Id: I12038012ff5a60512408b114db22f2638fd135b1
Closes-Bug: #1289496
Data Processing delete buttons missing icon

Refactor code to use DeleteAction instead of BatchAction.

Change-Id: I5ca73ddf169209a46d058c00960b376c935c2034
Closes-Bug: #1392909
Data Processing - capitalize some delete action buttons

Just some tiny nits.

Change-Id: Ib6f4882d352bea159800e73f9dfa0e7869e689e6
Add delete tests for Data Processing panels

Change-Id: I7f81f8157135def51110e54029a9ae60b54ee075
Closes-Bug: #1393171
Merge "Error messages for failing floating IP association"
Merge "Data Processing - capitalize some delete action buttons"
Merge "Data Processing delete buttons missing icon"
Merge "Add delete tests for Data Processing panels"