Do not try to run git config when git is not available

The state will not fail gracefully, instead you will get
an error like this one:

          ID: users_rhertzog_user_gitconfig_0
    Function: git.config_set
        Name: alias.br
      Result: False
     Comment: State 'git.config_set' was not found in SLS 'users'
              Reason: 'git' __virtual__ returned False
     Changes:

And since pillar data can't be (easily) tuned according to minion's
status, we really need this check here.

My tests with Salt 2017.7.3 have shown that cmd.has_exec() is reliable
for this, contrary the what the comment was implying.

Use correct pillar to set users homephone

add support for multiple private and public keys

corrected saltversioninfo check expression

Broken conditional and lack of line spacing

fixed insertion of multiple authorized keys via ssh_auth_pillar

* Add support for 'template' in 'user_files'

* Fix-up wrong nesting level for template value

* Small quality improvement for push upstream.

* Consistency improvement for variable name

Add ability to specify mode for files and symlinks in user_files

This reverts commit 48416398e3.

Added Solaris

Fixing a bug introduced in my previous commit

(Re-)enable pillar users-formula:lookup

Fixing my previous change which errors in a particular scenario.

Error: Conflicting ID 'users_ssh_auth_source_username_0' when keys are added and removed simultaneously.

Replace periods in username with underscores

Fixing the conflict and sending a new pull request

Fixes #118
Duplicate of #120

make AdminIdentity configureable per user

See merge request !1

Add ability to use templated user files

Add support for jinja code in bashrc files.

Add support for ssh_auth_sources.absent

Fixes: 150

fix gitconfig url insteadOf example

Previous example would result in quote escaping problem

* add ability to configure prime_group without gid

temp fix on git executable

Add support for hash_password