Add ~/.ssh/config management

This adds the ability to manage the ~/.ssh/config file for users.

Add prefix 'users_' to all first level keys to prevent duplicate ids …

Add the ability to pull ssh keys from a different pillar

Example pillar:

ssh_keys:
  id_rsa:
    privkey: |
      -----BEGIN RSA PRIVATE KEY-----
      MIIEowIBAAKCAQEAoQiwO3JhBquPAalQF9qP1lLZNXVjYMIswrMe2HcWUVBgh+vY
      U7sCwx/dH6+VvNwmCoqmNnP+8gTPKGl1vgAObJAnMT623dMXjVKwnEagZPRJIxDy
      B/HaAre9euNiY3LvIzBTWRSeMfT+rWvIKVBpvwlgGrfgz70m0pqxu+UyFbAGLin+
      GpxzZAMaFpZw4sSbIlRuissXZj/sHpQb8p9M5IeO4Z3rjkCP1cxI
      -----END RSA PRIVATE KEY-----
    pubkey: |
      ssh-rsa MIIEowIBAAKCAQEAoQiwO3JhBquPAalQF9qP1lLZNXVjYMIswrMe2H....

fixing example for sudo defaults for specific user

possibility to define Defaults specific to user

Added option to source ssh public keys from files.

Add 'ssh_auth_file' pillar key to generate an authorized_keys file from ...

google authentication pam module support

Add support for 'expire' and stop managing home directory if createhome is set to False

permissions.

Allow '!' prefix in password for disabled\locked accounts.

Signed-off-by: Tim Jones <me@prototim.com>

Update from upstream

Remove trailing slash from sudoers_dir

Sorry for the spam, simplify this remove_groups rule a bit

Add options for remove_groups and default to false

https://github.com/saltstack/salt/issues/2142

This has been causing issues for many people, as the remove_groups options is undocumented.  In the 2014.7 release this is changing, and remove_groups will default to false:
https://github.com/saltstack/salt/issues/13276

I'm going with false by default, as it's our use case and it will soon be the default.  If people believe this module should default to true and remove groups not listed, I think that's open for discussion, but we should at least add the option.

Change default shell to /bin/csh on FreeBSD

This also made it necessary to introduce an additional entry 'shell' into the
users lookup table as the formula previously conflated the shell used for
running the visudo command and the default shell to be used for user accounts.

Fixes: #48

Re-add ability to set shell per-user

Add 'createhome' option for 'user.present' state

Fix issue with bash binary location in FreeBSD

special case for root user

modified visudo to only report change in salt when there is an error. also add option to remove keys from ssh_auth