added new method to move hosts in hostgroups that match a certain regex

removed apply_hostgroup method

is being replaced by match_hostgroup

added force_hostgroup_match setting

set this to true if you want to perform hostgroup match
even on hosts that already have a hostgroup set.

added example default_hostgroup.yaml
Merge branch 'hostgroupmatch' of github.com:lotherk/foreman_default_hostgroup into hostgroupmatch