remove cookbook dependency version pinning

* cookbook version pinning should only happen in the cookbooks
themselves to avoid conflicts during integration-tests

Depends-On: Ic6b00a08ec29a9a7c04a72c743af5f756db45edf
Depends-On: Ib256c315d5439beb8d4ec83c5cc7d7c9b182378a
Depends-On: Ib11ceab6a4192057904c0111074d41176144e2a3
Depends-On: Ib4b3b9b30487b9fcb6438b4f88d3642916f52208
Depends-On: I5a8802103373b59effd8db18502a83563c085414
Depends-On: I50df0befac140660d58eccb939d33a83edbb441c
Depends-On: Ic7a5e1c9191a9083125583c274c08b9335728c39
Change-Id: I12f8fc81d0fc4426325af8c8efe05ed1adb79c8c

Berksfile

@@ -19,25 +19,8 @@ source 'https://supermarket.chef.io'
   else
     cookbook "openstack-#{cookbook}", github: "openstack/cookbook-openstack-#{cookbook}"
   end
+
 end
 
-cookbook 'apache2', '3.2.0'
-cookbook 'apt', '2.8.2'
-cookbook 'aws', '2.1.1'
-cookbook 'build-essential', '2.1.3'
-cookbook 'ceph', '0.9.2'
-cookbook 'database', '4.0.2'
-cookbook 'erlang', '1.5.8'
-cookbook 'mariadb', '0.3.1'
-cookbook 'memcached', '1.7.2'
-cookbook 'mysql', '6.0.13'
-cookbook 'mysql2_chef_gem', '1.0.1'
-cookbook 'openssl', '4.0.0'
-cookbook 'postgresql', '3.4.18'
-cookbook 'python', '1.4.6'
-cookbook 'rabbitmq', '4.2.2'
-cookbook 'xfs', '1.1.0'
-cookbook 'yum', '3.5.4'
-cookbook 'selinux', '0.9.0'
-cookbook 'yum-epel', '0.6.0'
+cookbook 'openstackclient', github: 'cloudbau/cookbook-openstackclient'
 cookbook 'statsd', github: 'att-cloud/cookbook-statsd'