Unpin beaker-rspec

The latest version of beaker tries to manage sshd_config[1] in order to
pass through environment variables. JJB also tries to manage
sshd_config by adding Match blocks to securely allow root SSH[2]. When
beaker tries to append the PermitUserEnvironment line after the Match
blocks, SSH fails to open port 22 and beaker can't SSH in to the
node[3]. This patch unpins beaker-rspec and adds set_env: false to the
nodepool nodesets so that the set_env method is never called and does
not try to mess with the sshd_config.

[1] https://github.com/puppetlabs/beaker/blob/master/lib/beaker/host_prebuilt_steps.rb#L528
[2] http://git.openstack.org/cgit/openstack-infra/project-config/tree/jenkins/jobs/puppet-module-jobs.yaml#n42
[3] http://logs.openstack.org/61/185161/1/check/gate-puppet-nova-puppet-beaker-rspec-dsvm-centos7/cd81608/console.html.gz#_2015-05-22_22_05_46_933
[4] https://github.com/puppetlabs/beaker/blob/master/lib/beaker/host_prebuilt_steps.rb#L502

Change-Id: I0784643812f9947afba4e2e556aadae3296f7e36

Gemfile

@@ -3,7 +3,6 @@ source 'https://rubygems.org'
 group :development, :test do
   gem 'puppetlabs_spec_helper', :require => false
   gem 'rspec-puppet', '~> 2.1.0', :require => false
-  gem 'minitest', '~> 4.7', :require => 'minitest/unit'
 
   gem 'metadata-json-lint'
   gem 'puppet-lint-param-docs'
@@ -17,7 +16,7 @@ group :development, :test do
   gem 'puppet-lint-variable_contains_upcase'
   gem 'puppet-lint-numericvariable'
 
-  gem 'beaker-rspec', '~> 2.2.4', :require => false
+  gem 'beaker-rspec', :require => false
   gem 'json'
   gem 'webmock'
 end

spec/acceptance/nodesets/nodepool-centos7.yml

@@ -7,3 +7,4 @@ HOSTS:
     ip: 127.0.0.1
 CONFIG:
   type: foss
+  set_env: false

spec/acceptance/nodesets/nodepool-trusty.yml

@@ -7,3 +7,4 @@ HOSTS:
     ip: 127.0.0.1
 CONFIG:
   type: foss
+  set_env: false