Fix F402 violations and re-enable gating

F402 got stricter in hacking 0.9, so fix new violations and
re-enable gating.

Change-Id: I81a1b14311ea6dc7f01353aa27d1f18f1aec8e81
Fix the section name in CONTRIBUTING.rst

The name of the section "If you're developer, start here"
has changed in the wiki, now is "If you're a developer".
This commit updates it to correctly refer to the
proper section.

Change-Id: Ida0406aab1af92687b9e8087a328a5f0e8ce1d9a
Merge "Fix F402 violations and re-enable gating"
Fix H307 violations and re-enable gating

H307 is a new rule in hacking 0.9, so fix new violations and
re-enable gating.

Change-Id: I805d10427ebeaee36589936f77a2cf0932c1378e
Fix H904 violations and re-enable gating

H904 got stricter in hacking 0.9, so fix new violations and
re-enable gating.

Change-Id: I7a3e9006cfb756da4893b9c0a6139a2e70c9aaf4
Fix H405 violations and re-enable gating

H405 is a new rule in hacking 0.9, so fix new violations and
re-enable gating.

Change-Id: I61541fa0a9dc18ad938df54d56c65c972b151622
Remove useless sources.json

Change-Id: If0595a079e5cb153c18e05cbd3ddaa64760638f1
Fix annoying typo in partition coordinator test

I don't know what I was thinking with this typo:

  s/ordination/coordination/

Change-Id: Iad5d159372b335a27cd7fe4b13c136617c0b0d10
update default_log_levels set by ceilometer

the current log levels are pretty old. update the current list to
extend current default default_log_level defined in oslo-incubator
and adding in stevedore and keystoneclient levels

Change-Id: I239645ef641613a994a48f20c0238e76dc9660f2
Partial-Bug: #1294789
Merge "Fix H307 violations and re-enable gating"
Merge "update default_log_levels set by ceilometer"
Merge "Remove useless sources.json"
Merge "Fix H904 violations and re-enable gating"
Merge "Fix H405 violations and re-enable gating"