Support reactivemongo v0.13.0

Hello and thanks for this plugin.

I faced several issues with trying to use reactivemongo as a driver for plugin version 2.0.7, all of which, I believe, are related to 0.12.x and block completely from using this driver if ssl connection option wants to be specified.

First, 0.12.7, the latest version of reactivemongo fails with error on trying to persist something because collection ‘does not exist’, which presumably happens because of index creation or something. The behaviour is pretty much as described in this thread: https://groups.google.com/forum/#!topic/reactivemongo/NsFBbcL71xA

reactivemongo.api.commands.bson.DefaultBSONCommandError: CommandError[code=26, errmsg=Collection myDb.coll doesn't exist, doc: {
  "ok": NumberDecimal(0.0),
  "errmsg": "Collection db.akka_persistence_metadata doesn't exist",
  "code": 26,
  "codeName": "NamespaceNotFound"
}

One can create akka_persistence_metadata and akka_persistence_realtime collections beforehand, but it is very weird to do that for every persistenceId, especially in case we use suffix appender feature.

Then, 0.12.6 and all versions below (0.12.x | x < 7) do not support ssl connection option:

[info] 2018-03-16 16:23:18.926 DEBUG [akka.contrib.persistence.mongodb.RxMongoDriver] [sample-actor-system-akka-contrib-persistence-dispatcher-8] Suffixed name for value "akka-persistence-journal" in settings and suffix "my-persistence-id" is "akka-persistence-journal_my-persistence-id"
[info] 2018-03-16 16:23:19.025 WARN  [reactivemongo.api.MongoDriver] [sample-actor-system-akka-contrib-persistence-dispatcher-8] Some options were ignored because they are not supported (yet): authMechanism, ssl
[info] 2018-03-16 16:23:19.035 INFO  [reactivemongo.api.MongoDriver] [sample-actor-system-akka-contrib-persistence-dispatcher-8] [Supervisor-1] Creating connection: Connection-2
[info] 2018-03-16 16:23:19.040 DEBUG [reactivemongo.api.MongoDriver] [sample-actor-system-akka-contrib-persistence-dispatcher-5] [Supervisor-1] Add connection to the supervisor: Connection-2
[info] 2018-03-16 16:23:19.060 DEBUG [reactivemongo.api.MongoConnection] [sample-actor-system-akka-contrib-persistence-dispatcher-8] [Supervisor-1/Connection-2] Waiting is available...
[info] 2018-03-16 16:23:19.232 DEBUG [reactivemongo.core.nodeset.ChannelFactory] [reactivemongo-akka.actor.default-dispatcher-3] Netty channel configuration:
[info] - connectTimeoutMS: 0
[info] - maxIdleTimeMS: 0ms
[info] - tcpNoDelay: false
[info] - keepAlive: false
[info] - sslEnabled: false
[info] 2018-03-16 16:23:19.947 DEBUG [reactivemongo.core.actors.MongoDBSystem] [reactivemongo-akka.actor.default-dispatcher-3] [Supervisor-1/Connection-2] Register monitor Actor[akka://reactivemongo/user/Monitor-Connection-2#-1851943013]
[info] 2018-03-16 16:23:19.990 DEBUG [reactivemongo.core.actors.MongoDBSystem] [reactivemongo-akka.actor.default-dispatcher-3] [Supervisor-1/Connection-2] Sends a fresh IsMaster request to Node[node1.sample.org:27017: Unknown (1/1 available connections), latency=9223372036854775807], auth=Set()
[info] 2018-03-16 16:23:19.995 DEBUG [reactivemongo.core.actors.MongoDBSystem] [reactivemongo-akka.actor.default-dispatcher-3] [Supervisor-1/Connection-2] Sends a fresh IsMaster request to Node[node1.sample.org:27017: Unknown (1/1 available connections), latency=9223372036854775807], auth=Set()
[info] 2018-03-16 16:23:20.122 DEBUG [reactivemongo.core.actors.MongoDBSystem] [reactivemongo-akka.actor.default-dispatcher-3] [Supervisor-1/Connection-2] Sends a fresh IsMaster request to Node[node1.sample.org:27017: Unknown (1/1 available connections), latency=9223372036854775807], auth=Set()
[info] 2018-03-16 16:23:20.181 DEBUG [reactivemongo.core.actors.MongoDBSystem] [reactivemongo-akka.actor.default-dispatcher-3] [Supervisor-1/Connection-2] The entire node set is still unreachable, is there a network problem?

Thus there is no way to connect to the set via ssl and not having troubles with new collections creation using reactivemongo for this plugin. I would very much prefer not to use casbah as it is declared legacy scala driver and does not support all features of new MongoDB versions (https://docs.mongodb.com/ecosystem/drivers/scala/#casbah).

I think it’s fair to assume that 0.12.x problems mentioned earlier are resolved in 0.13.0, so the request is to introduce support for this as a high priority

[scullxbones]

Released with v2.2.0

[scullxbones]

Fixed by #208