Add new OpenShiftAsciiDoc and AsciiDoc rules

[aireilly]

Adding new AsciiDoc and OpenShiftAsciiDoc rule sets to the list of packages.

AsciiDoc rules check for things like:

• Open attribute blocks
• Open quoted ID values
• Images and links that are missing accessibility alt tags
• Missing or incorrect callouts
• Unterminated admonition, listing, and table blocks
• Unbalanced if statements

OpenShiftDocs rules check for things like:

• "_additional-resources" role attribute declaration
• Terminal code block missing a command prompt at the beginning of the line.
• For example output, prepend the code block with '.Example output'.
• ID missing the "_{context}" variable at the end of the ID.
• Module missing the "_content-type" variable.
• Xrefs missing an anchor ID
• Use .adoc instead of .html in xrefs
• The xref is missing link text

cc @rohennes