Fix single quote and nil issues with cluster recipe

[TheSeubert]

This builds on #267 to add:

• More fixes to catch single quotes from cluster_status, current_cluster_node_type and node_name
  • Fixes from Add patterns to catch where the node name is surrounded by single-quotes #267 the node_name still had single quotes which were removed on L113
  • The cluster_status, disc_nodes and ram_nodes functions passed back a match of ["rabbit@rabbit1'","'rabbit@rabbit2"] which contained single quotes from the middle of the match. This was removed L83, L91 and L100

In rare instances, if the cluster_status returns on a non running server or is not clustered yet, the matchers caused no matched and nil errors. Fixes were introduced to pass nil in some functions through and to better handle them specifically with cluster_join:

• Passthrough of nil in some functions
• Additional debug logging and handling of nil responses from functions

[TheSeubert]

To note, this is also duplicates in some ways of #263 and #273 but with additional changes and differences in the way nil was handled.

[xiangyao1989]

This looks great! Fixed multiple nil issues in this recipe!