Fix the encrypted data bag support to load the secret from a file

This is consistent with the default setting in the attributes
Preserve the password for future master promotion
Only load secret if provided to allow fall back to default secret
use the repmgr_bin_path attribute to execute
Set version to 2.0
Add recipe for repmgr configuration
Fetch source via attribute to allow for easy overrides
Add template for repmgr.conf
Allow monitoring to be optionally enabled
Force replication role of node to be set always. Fix discovery option.
Include attribute to enable monitoring in init script
Check slave validity (#9)
Check as standby for slave confirmation
Default failover to manual
Allow GH based source pull
Add retries on resources to allow setup time. Implementation of slave confirmation (#9)
Fix problem where repmgrd does not stop on service stop.
Ensure we are always using `addressing` attribute
Some configurations are required to be available on standby nodes for failover, so ensure they are present
Include optional wal file set (should be updated to match replication namespaced attribute)