add support to list denied minions to salt-key
support 'den' parameter in salt-key options parser
Change timeout for CLI returns

This is a fix for #15905, the intent being that if you set a timeout it will actually time out. If you pass/set a timeout of 0 it will do the checking of minions etc to determine if the job is running. This seems to be a better compromise since the user/admin can decide wether to have timeouts or not
Add CLI timeout tests to standard client tests
Add tests for timeouts to client tests. In addition this makes all of the client functions have the same functionality
Update docs
lint fix
Merge branch 'develop' of github.com:saltstack/salt into develop
Attempt to fix race condition in return

This is due to our pinging of the minions for job returns, there is a non-zero amount of time between the job showing as "not running" on the minion and showing as recieved by the master. This will only be worse on Syndics-- so I'd recommend not using a 0 timeout value unless you have a small cluser
Merge remote-tracking branch 'upstream/develop' into list_denied_minions
create minions_denied in test-env, update wheel-test to expect minions_denied
Merge remote-tracking branch 'upstream/2014.7' into 2014.7_sam4
Merge remote-tracking branch 'upstream/2014.7' into 2014.7_sam4
Removed all the "os.listdir" based "checks"

* Per #15950 comparison against output of os.listdir is not a sane way to
test for existence of block devices.
Don't execute lsblk using absolute path

* Removed absolute path from lsblk call. Code already tests if lsblk is
in PATH, whichever lsblk satisfied that test in __virtual__ should be
the command that is called.
Changed src to None so not use 'id' for source estate
Still problem with dst estate hard coded to 'master'
Simplify mock of cmd.run via setUp method

* reduced code duplication by handling a frequently used mock in setUp
method to testcase
add expected output for denied minions to test_*
fix pylint errors
leave RaetKey() alone, it does not have minions_denied (yet)