Remove hyphens from group names

[manics]

Hyphens in group-names are deprecated

[DEPRECATION WARNING]: The TRANSFORM_INVALID_GROUP_CHARS settings is set to
allow bad characters in group names by default, this will change, but still be
user configurable on deprecation. This feature will be removed in version 2.10.
 Deprecation warnings can be disabled by setting deprecation_warnings=False in
ansible.cfg.
 [WARNING]: Invalid characters were found in group names but not replaced, use
-vvvv to see details