(QENG-1018) default dev_builds_url in Beaker needs to be updated

- update to builds.delivery.puppetlabs.net
(GH-425) Sleep after killing processes

This avoids a race condition in which the killed processes haven't
exited by the time we try and unmount the root fs and the call to
container.delete errors.
(QENG-1186) Fix Beaker::DSL:Helpers.puppet_{user,group}

Looks like the contents of these methods were mixed upwhen originally written.
Luckily the puppet user is usually the same as the puppet group.

Signed-off-by: Wayne <wayne@puppetlabs.com>
(QENG-797) Enhance Beaker to look for x64 installers for Windows

- add ability to install 64 bit pe builds (available for pe 3.4)
- add is_x86_64? method to host, convenience method for determining arch
  of host
(QENG-1026) Add support for x64 PE windows to Beaker

- default to installing 64 bit builds on 64 bit windows
- support install_32 host option, true = install 32 bit no matter the
  arch, false/unset = install 64 bit on 64 bit, otherwise 32 bit
(QENG-1129) support win64 open source builds

- add ability to install 64 bit windows builds
- supported when puppet version is 3.7+ or pe is 3.4+, and install_32 is not set for
  host or globally
- correctly update path post pe/puppet installation
Merge pull request #436 from anodelman/win-fix

(QENG-797) Enhance Beaker to look for x64 installers for Windows
Merge pull request #425 from jtopper/avoid_docker_clean_race

(GH-425) Sleep briefly after killing processes - Docker
Merge pull request #445 from waynr/fix/qeng-1186-beaker-dsl-helpers-puppet-mixup

(QENG-1186) Fix Beaker::DSL:Helpers.puppet_{user,group}
QENG-1199 add .bundle to ignore list
Merge pull request #448 from cyberious/AddIgnores

QENG-1199 add .bundle to ignore list
Merge pull request #412 from anodelman/maint

(QENG-1018) default dev_builds_url in Beaker needs to be updated
(QENG-526) A friendly way for Beaker to set environment...

... variables for SUTs

- add support for option :host_env, it can be set in the host
  configuration file
- requires updating each host so that sshd allows remotely setting
  environment variables
- add host.add_env_var(key,val) and host.delete_env_var(key,val) for
  using in test writing