add migrate setting (https://tickets.puppetlabs.com/browse/PDB-4636)

Author: csmithATsquiz

README.md

@@ -365,6 +365,10 @@ Specify the supported SSL protocols for PuppetDB (e.g. TLSv1, TLSv1.1, TLSv1.2.)
 Configure jetty's supported `cipher-suites` (e.g. `SSL_ECDHE_ECDSA_WITH_AES_256_CBC_SHA384`).
 Defaults to `undef`.
 
+#### `migrate`
+
+If `true`, puppetdb will automatically migrate to the latest database format at startup. If `false`, if the database format supplied by this version of PuppetDB doesn't match the version expected (whether newer or older), PuppetDB will exit with an error status. Defaults to `true`.
+
 ### `manage_dbserver`
 
 If true, the PostgreSQL server will be managed by this module. Defaults to `true`.

manifests/params.pp

@@ -53,6 +53,7 @@
   $conn_lifetime          = '0'
 
   $max_threads            = undef
+  $migrate                = true
 
   # These settings are for the read database
   $read_database                     = 'postgres'

manifests/server/database.pp

@@ -24,6 +24,7 @@
   $puppetdb_user          = $puppetdb::params::puppetdb_user,
   $puppetdb_group         = $puppetdb::params::puppetdb_group,
   $database_max_pool_size = $puppetdb::params::database_max_pool_size,
+  $migrate                = $puppetdb::params::migrate,
 ) inherits puppetdb::params {
 
   if str2bool($database_validate) {
@@ -165,6 +166,11 @@
     value   => $conn_lifetime,
   }
 
+  ini_setting { 'puppetdb_migrate':
+    setting => 'migrate',
+    value   => $migrate,
+  }
+
   if $puppetdb::params::database_max_pool_size_setting_name != undef {
     if $database_max_pool_size == 'absent' {
       ini_setting { 'puppetdb_database_max_pool_size':