Improve the reclass_data_source ID declaration

This commit does two changes to the reclass_data_source ID declaration:

* the git.latest "rev" and "branch" expressions are changed to be consistent
  with what's done in salt-formula-salt [*].
* the "force_reset" parameter is added. This parameter is required to be able
  to use specfic branches of the model repo.

[*] <https://github.com/tcpcloud/salt-formula-salt/blob/0b33d6717ef7766eb0031ad6503eede620d249fb/salt/master/env.sls#L150-L168>
1 file changed