Watchmaker

**Summary**:

* join-domain-formula
- Fixes detection of running system's join state, searches for shortname, and retries joins
- Improves compatibility with strict Bash
- Adds option to skip GPG check
* amazon-inspector-formula
- Adds option to skip GPG check
* splunkforwarder-formula
- Redirects splunk log folder with symlink
- Adds option to skip GPG check

**Summary**:

* join-domain-formula
- Updates find-collision.sh ldap search to include uppercase and lowercase versions of provided hostname
* scap-formula
- Adds script to build OSCAP content with 'stig' profile included for CentOS
- Updates OSCAP content to v0.1.44
* watchmaker-salt-content
- Switches Linux scap profile pillar settings to 'stig'

**Summary**:

* Adds salt content locally as a submodule to better support Watchmaker standalone packages
* dotnet4-formula
- Updates formula to support the use of Python3 versions of Salt
* join-domain-formula
- Adds additional enhancements and logic to better handle the domin-join process in Linux

**Summary**:

* ash-linux-formula
- Removes outdated and conflicting states to allow setting of custom banner text
* join-domain-formula
- Fixes issue with improper handling of admin names with spaces in Windows

**Summary**:

* join-domain-formula
- (Linux) Avoids `unique` jinja filter to preserve compatibility for older
versions of salt

**Summary**:

* Updates documentation to install pip using `ensurepip` module instead of external
`get-pip.py`
* ash-linux-formula
- Adds pillar option to set content for `/etc/issue` login banner
* join-domain-formula
- (Linux) Adds pillar option to pass a list of domains to add to the trust
list