lint whitespace
lint fix RaetError.__str__
lint - Undefined variable 'CalledProcessError'
lint whitespace
lint - __init__ method from base class 'Exception' is not called
comment lint
lint - Unnecessary parens after u'if' keyword
lint -  Unnecessary parens after u'return' keyword
whitespace lint
Add backups_enabed option to Digital Ocean create().

- Group backups_enabled and private_networking, the two binary options.
- private_networking now absent if excluded rather than 'false'.
- Deal with non-binary arguments explicitly as other providers do.

Digital Ocean profiles can now take 'backups_enabled: [True|False]'. (As
of Jan 2014 this option must be specified on instance creation and can
no longer be enabled for already-created droplets, so it's fairly
necessary.)

An incidental change is that private_networking won't default to False
if not specified - by salt-cloud - but that is still the provider's
default, and where the default should be coming from if a profile isn't
explicit.
Add private_networking and backups_enabled options to docs.
Merge pull request #10377 from Stelminator/lint_fixes_2014_02_11

lint fixes
solr module: add support for username and password
Merge pull request #10381 from ranl/develop

solr module: add support for username and password
Refactor without loop on tuple.
Merge pull request #10378 from hipikat/digitalocean-backups

Add backups_enabled for Digital Ocean salt-cloud provider
Fix lint issues and make use of the helpers.

Double to single quotes.
Remove unused imports
Remove unused import
Remove unused import