Enable natresolver and natdnsproxy for vagrant.

There are cases where tests run will fail when trying to download
from the outside world due to dns issues. In order to resolve this
I configured the natdnsproxy1 and natdnshostresolver1 vagrant settings
(QENG-1261) remove solaris-10 specific ntpdate options.  -w causes an
error.
remove related spec test.
(QENG-1054) Add functionality to install_pe to modify answers...

...file before install

- add ability to add custom_answers to individual hosts to be appended
  to answer file
- rework answer file code so that answers are an object that can be
  queried for an answer string
- instead of querying env for individual answers just pull in anything
  that matches q_*
- pull the default answer values into the presets so that it is more
  easily tracked
Merge pull request #467 from anodelman/master

create beaker 1.19.1 gem
(gh-470) refactoring natdns to use the unless syntax
Merge pull request #422 from liamjbennett/vagrant_natdns

Enable natresolver and natdnsproxy for vagrant.
(gh-471) Adding support to vagrant for box_version and box_check_update.

If using versioned boxes from vagrant cloud and a new update is
published, by default vagrant will attempt to update that box to
the latest version. This may be undesired behaviour. Like any other
versioned object you way wish to fix that initial download to a
fixed version or a version range.
Merge pull request #418 from liamjbennett/vagrant_box_update

Adding support to vagrant for box_version and box_check_update.
Added link to installation instructions to README.md
(QENG-1206) Acceptance failing when trying to install epel-release...

and EPEL packages from public mirrors
- add ability to set epel_url, epel_arch and epel_package as global
  options or on a per-host basis
- added reasonable default values
(QENG-1146) Add vagrant_fusion, vmware_workstation, and vagrant_virtualbox providers

Currently the vagrant hypervisor provider just does virtualbox. This
allows the vagrant vmware_fusion and vmware_workstation plugins to be
used instead.
Merge pull request #479 from anodelman/epel

(QENG-1206) Acceptance failing when trying to install epel-release...
Merge pull request #476 from leoarnold/master

Added link to installation instructions to README.md
Merge pull request #464 from anodelman/answers

(QENG-1054) Add functionality to install_pe to modify answers...
Merge pull request #462 from er0ck/fix/master/QENG-1261-fix_ntpdate_on_solaris10

(QENG-1261) remove solaris-10 specific ntpdate options
Merge pull request #271 from hunner/add_fusion

(QENG-1146) Add vagrant_fusion, vagrant_workstation and vagrant_virtualbox providers