Provide ability to override db settings

Capability to set PuppetDB database backend address to anything.
Previously, peadm::util::update_db_setting would always attempt to pair
configuration with appropriate availability group letter but in DR
scenarios this is not appropriate.

Author: ody

documentation/automated_recovery.md

@@ -22,7 +22,7 @@ Procedure:
 
 2. Temporarily set both primary and replica server nodes so that they use the remaining healthy PE-PostgreSQL server
 
-        bolt plan run peadm::util::update_db_setting --target <primary-server-fqdn>,<replica-server-fqdn> primary_postgresql_host=<working-postgres-server-fqdn>
+        bolt plan run peadm::util::update_db_setting --target <primary-server-fqdn>,<replica-server-fqdn> primary_postgresql_host=<working-postgres-server-fqdn> override=true
 
 3. Restart `pe-puppetdb.service` on Puppet server primary and replica
 

plans/util/update_db_setting.pp

@@ -6,28 +6,33 @@
   TargetSpec                        $targets,
   Optional[Peadm::SingleTargetSpec] $postgresql_host = undef,
   Optional[Hash]                    $peadm_config    = undef,
+  Boolean                           $override        = false
 ) {
 
   # FIX ME: Section needs to be parallelized, can't use built in functionality
   # of apply().
   get_targets($targets).each |$target| {
 
-    # Existing config used to dynamically pair nodes with appropriate PSQL
-    # server
-    $roles = $peadm_config['role-letter']
+    if $override {
+      $db = $postgresql_host
+    } else {
+      # Existing config used to dynamically pair nodes with appropriate PSQL
+      # server
+      $roles = $peadm_config['role-letter']
 
-    # Determine configuration by pairing target with existing availability letter
-    # assignments, setting to the new node if no match is found.
-    $target_group_letter = peadm::flatten_compact([$roles['compilers'],$roles['server']].map |$role| {
-      $role.map |$k,$v| {
-        if $target.peadm::certname() in $v { $k }
+      # Determine configuration by pairing target with existing availability letter
+      # assignments, setting to the new node if no match is found.
+      $target_group_letter = peadm::flatten_compact([$roles['compilers'],$roles['server']].map |$role| {
+        $role.map |$k,$v| {
+          if $target.peadm::certname() in $v { $k }
+        }
+      })[0]
+      $match = $roles['postgresql'][$target_group_letter]
+      if $match {
+        $db = $match
+      } else {
+        $db = $postgresql_host
       }
-    })[0]
-    $match = $roles['postgresql'][$target_group_letter]
-    if $match {
-      $db = $match
-    } else {
-      $db = $postgresql_host
     }
 
     $db_setting = "//${db}:5432/pe-puppetdb?ssl=true&sslfactory=org.postgresql.ssl.jdbc4.LibPQFactory&sslmode=verify-full&sslrootcert=/etc/puppetlabs/puppet/ssl/certs/ca.pem&sslkey=/etc/puppetlabs/puppetdb/ssl/${target.peadm::certname()}.private_key.pk8&sslcert=/etc/puppetlabs/puppetdb/ssl/${$target.peadm::certname()}.cert.pem"