Prefer () to continue line per PEP8

There were some long lines that were split using \ rather than ().
PEP8 recommends using () --
http://legacy.python.org/dev/peps/pep-0008/#maximum-line-length

Change-Id: I8e140e507d0d9991094be13ebafa7fc700c1a02e
Rename HTTPError -> HttpError

With the move to the apiclient exceptions from oslo the basic HTTP error
class was renamed. This was not reflected in all places in the code.

It was also not picked up by the tests because the apiclient tests
weren't running due to a missing __init__.py file. Because this should
be backwards compatible it was added to the list in exceptions, the
check that this is available is in the (now running) apiclient tests.

Blueprint: common-client-library-2
Change-Id: I307c1083f29e3207cc86aa938043270e5c32b4bb
Fix typo of ANS1 to ASN1

Replace all occurrences of 'ANS1|ans1' with 'ASN1|asn1'.  Keep
cms.is_ans1_token() around for backwards compatibility.

Change-Id: I89da78b89aa9daf2637754dc93031d7ca81e85cb
Closes-bug: 1306874
Merge "Fix typo of ANS1 to ASN1"
Merge "Prefer () to continue line per PEP8"
Merge "Rename HTTPError -> HttpError"