ClusterTools2 not required for bootstrapping

[jschaef]

the module tries to install ClusterTools2 package which is not part of any SLE12 or SLE15 repository but instead
maintained on github.

The package seems not to be used during bootstrapping and not required to administer and setup a ha_cluster.
If desired the user can install the package after bootstrapping the cluster.

The error thrown during salt-call --local state.apply cluster:

ID: install_cluster_packages
    Function: pkg.installed
      Result: False
     Comment: Attempt 1: Returned a result of "False", with the following comment: "An error was encountered while installing package(s): Zypper command failure: Running scope as unit: run-r438c7753a5094496bafb867930b1ce58.scope
              Package 'ClusterTools2' not found.Loading repository data...

It would be welcomed to have the package removed from states/cluster/packages.sls