Add mongodb_storage_dirperdb variable

Add the mongodb_storage_dirperdb variable to the defaults (set to false)
Add the variable unconditionally into the mongod_init.conf.j2 and
mongod.conf.j2 templates.

defaults/main.yml

@@ -41,6 +41,8 @@ mongodb_security_keyfile: /etc/mongodb-keyfile   # Specify path to keyfile with
 
 ## storage Options
 mongodb_storage_dbpath: /data/db                 # Directory for datafiles
+mongodb_storage_dirperdb: false                  # Use one directory per DB
+
 # The storage engine for the mongod database. Available values:
 # 'mmapv1', 'wiredTiger'
 mongodb_storage_engine: "wiredTiger"

templates/mongod.conf.j2

@@ -38,6 +38,7 @@ security:
 
 storage:
   dbPath: {{ mongodb_storage_dbpath }}
+  directoryPerDB: {{ mongodb_storage_dirperdb }}
   {% if mongodb_major_version | version_compare("3.0", ">=") -%}
   engine: {{ mongodb_storage_engine }}
   {% endif -%}

templates/mongod_init.conf.j2

@@ -21,6 +21,7 @@ security:
 
 storage:
   dbPath: {{ mongodb_storage_dbpath }}
+  directoryPerDB: {{ mongodb_storage_dirperdb }}
   {% if mongodb_major_version | version_compare("3.0", ">=") -%}
   engine: {{ mongodb_storage_engine }}
   {% endif -%}