Added support for mongo 3.4 when executing against RedHat

.travis.yml

@@ -51,6 +51,10 @@ env:
     DISTRIBUTION=centos
     DIST_VERSION=7
     MONGODB_VERSION=3.2
+  - >
+    DISTRIBUTION=centos
+    DIST_VERSION=7
+    MONGODB_VERSION=3.4
 #  - >
 #    distribution=ubuntu-upstart
 #    version=12.04

vars/RedHat.yml

@@ -4,8 +4,10 @@ mongodb_repository:
   "2.6": "http://downloads-distro.mongodb.org/repo/redhat/os/$basearch/"
   "3.0": "https://repo.mongodb.org/yum/redhat/$releasever/mongodb-org/3.0/$basearch/"
   "3.2": "https://repo.mongodb.org/yum/redhat/$releasever/mongodb-org/3.2/$basearch/"
+  "3.4": "https://repo.mongodb.org/yum/redhat/$releasever/mongodb-org/3.4/$basearch/"
 
 mongodb_repository_gpgkey:
   "3.2": "https://www.mongodb.org/static/pgp/server-3.2.asc"
+  "3.4": "https://www.mongodb.org/static/pgp/server-3.4.asc"
 
 mongodb_pidfile_path: "{{ '/var/run/mongodb/mongod.pid' if ('mongodb-org' in mongodb_package) else '' }}"