Added function to makeconf module to remove a var

Allows for completely removing a variable from the make.conf file
Added absent state to makeconf state
Bugfix import of yaml. Add CLI example to docstring. Return the value.
Fix a bug of getting an incorrect active log level.
Merge pull request #3231 from kjkuan/bugfix-cli-loglevel

Fix a bug of getting an incorrect active log level.
Improve `salt.modules.debconfmod` + PEP8.

A missing package is a warning not a error on since salt will run perfectly fine without that package. The module depends on that package but salt does not.
The test suite local client now properly receives the events. Fixes #3214.

* We were instantiating the integration testing local client too soon in the process. Deferring it to a little latter made it all work.
* Added the ability to dump the master and minion testing configurations to files. Just prepend the `runtests` call with `DUMP_SALT_CONFIG=1` and you'll get the computed configuration files in `/tmp/salttest/{master,minion}`.
* We now also un-subscribe from the event's once done.
* Added `salt.utils.event.LocalClientEvent` just to differentiate from `salt.utils.event.MasterEvent` in the logs so we know who's who. It's just a subclass of the latter.
Merge pull request #3232 from s0undt3ch/issues/3214

The test suite local client now properly receives the events. Fixes #3214.
Merge pull request #3233 from s0undt3ch/develop

Improve `salt.modules.debconfmod` + PEP8.
Merge pull request #3230 from torhve/develop

Bugfix import of yaml. Add CLI example to docstring. Return the value.
Merge pull request #3228 from shadowfax-chc/makeconf-del

Makeconf del
Undoing unintentional change with callable
Adapt to the new local client events changes. Fixes #3214.
typo..
Merge pull request #3236 from MTecknology/develop

Undoing unintentional change with callable
Fix saltstack/salt-bootstrap#10
Fix issue when extensions are not installed with jinja2
Merge pull request #3237 from s0undt3ch/issues/3214

Adapt to the new local client events changes. Fixes #3214.
Fix docstrings for the outputters
Change the default outputter in salt-call to be nested