Makes kombu_ssl_* parameters optional when rabbit_use_ssl => true

[imcsk8]

Currently if one tries to enable SSL for AMQP via rabbit_use_ssl in the
puppet-neutron module it fails if the kombu_* options aren't also set.

Fixes: rhbz#1146136

[paramite]

Ivan, following info pretty much simplifies checking the PR. Please in future don't forget to add that info:
[para@sanitarium puppet-neutron]$ git log --oneline --no-merges 0a7e0f1..141e65a
141e65a Makes kombu_ssl_* parameters optional when rabbit_use_ssl => true
7d20fc9 Add ability to manage Neutron ML2 plugin package state
48aa3fb New manifest file to deploy Cisco N1KV-VEM
c848aff Add plugin config file to /etc/default/neutron-server
70ef4af Makes ca_file parameter optional when use_ssl => true
c7f8696 Hide secrets from puppet logs
3848a2b minor fixes for cisco nexus ml2 plugin
c40f300 Make Nova_admin_tenant_id_setter notify neutron-server.
3820c41 Use 2.2 as the default mysql_module
8d488fb agent/lbaas: fix HAproxy package relationship
4ab8a0e Rename QUOTAS section for quotas
bddd060 Add linuxbridge mechanism support for ML2 plugin
0346d48 Add ability to configure dhcp_agent_notification
2da560c Add network_device_mtu to neutron.conf
5b3abcf Undeprecate enable_security_group parameter
064899b for OVS agent, fix dependency on service
c4e4818 Install neutron-plugin-ml2 package on Ubuntu
a6102c0 Add vpnaas_agent_package parameter to FWaaS
763ec35 Simplify ml2_config.ini symlink resource management
837e27c Make Modulefile summary and description consistent
68ddc7a Support for Cisco ML2 Mech Driver
cfd0abb ml2: fix neutron-server restart
d59bf66 nova-notifs: allow to use secure keystone endpoint
a28f734 Link from ovs config file to plugin.ini on RedHat
3379806 Normalize Gemfile & pin tests to rspec < 2.99
d1235d7 Add multi-region support
b3203f6 Refresh Neutron server
dd301f6 Pin tests to rspec < 2.99
5d953a4 stop puppet from breaking neutron
069d086 Configure OVS Agent when using ML2 plugin
1055a12 Set default metadata backlog to 4096
40f98ee Fix puppet-neutron rspec test for RSpec >= 3.0.0
d202e4b Added '' as a valid value for gateway_ip
3b6abf0 Add parameter to set veth MTU
f48ce94 Enable neutron server to be run in SSL mode
f1ae25a SSL for communication between neutron and rabbitmq

[paramite]

Note that this commit moves our icehouse branch out of upstream stable/icehouse to upstream master. We should stick with upstream stable/icehouse. Please create new PR with correct update.