Add optional version parameter to has_module()

[ekohl]

Currently extlib::has_module($name) can be used to check if a module is present. It could benefit from an optional parameter to check for a specific version (range). This could allow easy soft dependency checks with version numbers:

if $git {
  unless extlib::has_module('theforeman-git', '>= 5.0.0 < 8.0.0') {
    fail('theforeman-git 5.x, 6.x or 7.x is needed for this functionality')
  }
}

If the parameter is not specified, it should use the current behavior. It would be equivalent to having a default value of >= 0.