Change object API_NAME to 'object_store'

Previously the API_NAME was 'object-store' which caused all sorts
of failures when running swift commands

Change-Id: I448ca10f7d173024313722246e63cf23fd71117c
Closes-Bug: #1343658
Fix PEP8 E302 errors

Also add remaining skipped checks to HACKING

Change-Id: I0c4333ce29597e0a8a233af17c15bed2b4d0711f
Merge "Change object API_NAME to 'object_store'"