Use uppercase for `OS` env variable

This is used for Windows system where this environment variable
is case-insitive. However, if Windows/Cygwin is used, Python
is case-sensitive and the conditions fail.
Add output_loglevel param to cmd.run* functions

Also deprecates the "quiet" param, and alters the logging behavior of
cmd.run* and cmd.retcode. cmd.run_all no longer is the only one of these
that logs the cmd output at loglevel ERROR if the retcode is nonzero.
If the command has a nonzero exit status, then the minimum loglevel at
which the output will be logged is ERROR (if the output_loglevel was set
higher, than that level will be used).

The "quiet" loglevel still works as before, suppressing all output
logging for the command, even if there was an error.
Fix refs to cmd.run* with quiet=True

This changes these references to use output_loglevel='quiet'
Lower loglevel for verbose pkg mgmt commands

This uses the new output_loglevel argument to force these commands to
log their output to loglevel DEBUG. Note that any error encountered in
running these commands will log the output at loglevel ERROR.
Add 'critical' loglevel to salt.log.setup.LOG_LEVELS
Fix spelling error
Laying the groundwork for overstate unit testing.
Pylint
Expose the highstate while we're building it, to let pydsl include correctly.
Unit test for including a state multiple times using pydsl.
Missing newline
Made state_highstate more useful.
Revert "Always generate same order of bonding options"

This reverts commit 8db3b4606942e4ee1f111338304d86375f3fa495.
Fix bond and bridge option rendering order, add more bridge options

Better way of handling option ordering in bond and bridge interfaces
and add missing bridge options.
Add complete option parsing for Debian bridge interfaces

Inspired by bond option parsing.

Bridge option checks are based on debian man page:
http://manpages.debian.net/cgi-bin/man.cgi?query=bridge-utils-interfaces
format instead of printf
More tests.
Check failed prereqs.
Check successful prereq
Put cloud providers in alphabetical order