Manipulating Linux /etc/group group members (Ref: Issue# 11102)

(1) modules/groupadd.py : Extending by adding three new functions.
adduser, deluser, members . For now it assumes an OS command ‘gpasswd’
is available
.

(2) states/group.py : states.group.present state function is refactored
(along the lines of states.users.present)  to support the following new
options.
  - addusers
  - delusers
  - members

This patch is for review now. This  is currently tested on CentOS(RHEL)
distributions.
Old group.present() state function is renamed as present_old() for now.
Refactor and modularize of the loader interface, adding Map to pyobjects

The problem with using the loaded states (see commit cc8539f) is that
you can end up in situations where a particular state doesn't exist for
whatever reason. This prevents you from building states freely (see
ticket #10918).

The refactor focuses on breaking out the `gen_functions` function into a
number of smaller reusable functions so that pyobjects can load all of
the states and still process `__virtual__()` and `__virtualname__` in a
way that makes sense for building states. After all pyobjects is just
compiling a high state data structure, if a state is available or not
during application time is up to the minion.

As part of this refactor I have also updated all of the inline comments
in the loader to be more consistent with the way things are actually
working now (such as `__virtual__()` returning a string being
deprecated).

There are also some pep8 fixes to the loader file.

Fix #10918

----

This also adds a new feature to pyobjects named `Map`, which allows for
definition of grain dependent data in a pythonic way -- using inner
classes.

----

Lastly this ditches the instance based registry and instead uses a class
based approach like a singleton.
Move OverState and state.sls docs to new location
Add new page to toctree
Add sub-titles to other states tutorial pages
Rename state.sls runner to state.orchestrate

Aliases "orch" and "sls" added.
Hide function aliases from docs
Merge pull request #11216 from terminalmage/orchestrate-runner

Rename state.sls runner to state.orchestrate
Merge pull request #11218 from terminalmage/docs

New module busywork for htpasswd state/module
return the right data from pub
Use the right event classes
Query TXT records
Attack to the ajacent node's yard
Correctly route the event system
Pass the transport type to the event creation
Avoid unnecessary getgrall code. Use getgrouplist if available
Add salt-git-ssh script to pass the ssh identity to the git command.
Use salt-git-ssh script as the GIT_SSH command for git when using
private keys on ssh based repositories.
Removed unused import tempfile.
Moved git wrapper script to the package templates directory