Commits on Oct 26, 2018

1. Enhance galera to interact over multiple clusters …

   This change adds a new resource agent "stretch_galera"
   which builds off of the existing "galera" agent.
   To accommodate this, the "galera" agent's shell script
   structure is modified slightly so that it can be sourced
   for its functions.
   
   The new resource agent adds a new parameter "remote_node_map"
   to the Galera resource agent which allows it to consider
   galera node names that are in other clusters as part of its
   Galera quorum.  To achieve this, it launches read-only pcs
   commands to the remote clusters in order to view and modify
   remote state variables.
   
   Additionally, the stretch agent honors an optional pcs
   attribute <node>-initial-bootstrap which when applied to the
   local pcs nodes, will allow Galera to be bootstrapped with only
   that subset of nodes, without the additional remote nodes
   being available yet.  An installer can set these attributes
   to allow the first pcs cluster to come online before subsequent
   clusters, and then remove the attributes.

   

   zzzeek committed Oct 26, 2018
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