Enable the usage of existing 'salt-call -m' option.

Currently, the ``-m`` flag for salt-call has no effect in the loaders.
This commit allows users to specify exactly the module dirs to load
given that they follow the naming conventions for 'grains', 'runners',
'modules', 'states', etc. This is a shortcut for having to refresh cache
state when using a masterless salt-call.
allow matching on presence of a key when value is a dict
allow matching on presence of a key when value is a dict -- for grains too
Move __salt__['config.is_true'] to salt.utils

This function doesn't need to interact with the rest of the modules, so
it fits better in salt.utils.
Fix refs to __salt__['config.is_true']
Make rh_service.py properly support upstart

This fixes #3183.
Merge pull request #4225 from torhve/develop

Monitoring fixes
Merge pull request #4227 from terminalmage/issue3183

 Move config.is_true, make upstart work properly in rh_service.py
Adding startup scripts for salt-bootstrap to use on OpenBSD
Perform a 'systemctl --system daemon-reload' when needed

If a custom unit file is added to /etc/systemd/system, or the given unit
has been modified since the last time systemctl --system daemon-reload
was run, perform the daemon-reload.
Look for custom initscripts in /etc/init.d

While RHEL symlinks /etc/init.d to /etc/rc.d/init.d, /etc/init.d is the
path typically referenced, and indeed /sbin/service looks directly in
/etc/init.d. This commit will account for the corner-case where a distro
does not symlink /etc/init.d to /etc/rc.d/init.d/.
Merge pull request #4228 from kmwhite/feature-add_openbsd_startup_scripts

Adding startup scripts for salt-bootstrap to use on OpenBSD
Add some more debugging logging. Remove double quotes.
Fix log message. The file might not have been loaded(if it does not exist for example).
Merge pull request #4233 from s0undt3ch/develop

Add some more debugging logging. Remove double quotes.
Merge pull request #4230 from terminalmage/develop

Look for custom initscripts in /etc/init.d
fix typo
Merge pull request #4234 from giantlock/develop

fix typo
Added notes on installing psutil via pip

Python header files are required, and may not be installed depending on
your distro. Added a paragraph mentioning this.
Merge pull request #4235 from terminalmage/docs

Added notes on installing psutil via pip