add master_alive_interval options
remove __mine_interval_job, moved to minion.py
enable the minion to detect if the master disconnected using a scheduled job. has to be explicitly enabled by
setting the master_alive_interval in the minions config. the handling of the __master_disconnect event is still
POC. not yet sure what to do in it and how to make it as flexible as possible.
first version of server density monitoring modules
yumpkg: refine pkg.hold/unhold

This brings these functions more in line with Salt design standards, in
that an error case raises an exception which can be caught elsewhere.
Returning different data types depending on success or error, and then
doing type checking later on, is not pythonic.
aptpkg: refine pkg.hold/unhold

This brings these functions more in line with Salt design standards, in
that an error case raises an exception which can be caught elsewhere.
Returning different data types depending on success or error, and then
doing type checking later on, is not pythonic.
Refine hold/unhold behavior in pkg.installed state

This adds exception handling to more gracefully report on problems
encountered while attempting to hold packages.
Remove yum-specific code

This is what happens when you copy and paste, and don't pay attention.
Switch to arg parser.

Resolves #13294
A deep copy should be used for default options.

Use deep copy to get default master and minion options to avoid altering
them.

This fixes an issue encountered when defining grains for multiple nodes in a salt-cloud map file.
Nodes deployed later in the process were getting grains for previously deployed nodes.
Move log levels in scheduler up

Too much was being logged to debug. Make errors more promenent and
move job exec events up to info. Closes #10621
Add CommandExecutionError to exception handling

aptpkg's set_selections (called by hold/unhold) could potentially raise
this exception, so catch it as well.
aptpkg: Fix call to get_selections()

This was passing "hold" as a name, not a quoted string (which succeeded
since there is a function named "hold" in the module), causing the
retrieved selections to be empty, leading to a traceback when the
function later tries to run set_selections().
Merge pull request #13374 from cachedout/10621

Move log levels in scheduler up
Merge pull request #13366 from terminalmage/refine-pkg-hold

Refine hold/unhold behavior in pkg.installed state
More descriptive logging for token failures
Closes #13369

Need to set the password in vm_ which used to happen inside what is now
request_instance, but was never added.
Fixed docstring typo
don't always overwrite the error_msg

error_msg='Failed to upload file {0!r}: {1}\n{2}', is in scp_file
Merge pull request #13378 from rallytime/docstring_fix

Fixed docstring typo
fix pylint errors