1.5.1 prep.
Merge pull request #328 from mhaskel/1.5.1-prep

1.5.1 prep.
Adds check to params.pp if lab-release is not installed
Adds spec test

If lab-release is not installed, then the end user sees a confusing/ vague message
Error: Unsupported lsbdistid () at /modules/apt/manifests/params.pp:52
It is common for docker containers to not include this package by default

After fix, the user sees a friendlier message if lab-release is not installed
Error: Unable to determine lsbdistid, is lsb-release installed? at /modules/apt/manifests/params.pp:52
Fix inconsistent $proxy_host handling in apt and apt::ppa.

- The default for $proxy_host is undef
- apt considers $proxy_set to be absent if $proxy_host is undef
- apt::ppa considers proxy_env to be empty if $proxy_host is false or ''

This results in apt::ppa to consider $proxy_host to be set when the default undef is used
breaking ppa resources because $proxy_env becomes:
  [http_proxy=http://:8080, https_proxy=http://:8080]

Fix this by making both apt and apt::ppa consider $proxy_host to be unset when it is
any of false, '', or undef.
Fix mistake in my 0c2329b implementation.
Prepare a 1.5.2 release.
Merge pull request #331 from apenney/152-release

Prepare a 1.5.2 release.
Merge remote-tracking branch 'upstream/1.5.x'
Merge pull request #334 from mhaskel/1.5.x-merge

1.5.x merge
Merge pull request #329 from spuder/spuder/lsbdist

Adds check to params.pp if lab-release is not installed
Fix broken acceptance tests.

New fact was added that matched a regex breaking the always_apt_update
tests.  Updated the tests to check for the apt_update exec, not just the
string apt_update.
Merge pull request #335 from mhaskel/fix_acceptance_tests

Fix broken acceptance tests.
Debian seems to have hanging apt-get and/or dpkg processes, so kill
those.
Merge pull request #330 from dantman/master

Fix inconsistent $proxy_host handling in apt and apt::ppa.
Merge pull request #336 from mhaskel/fix_acceptance_tests

Debian seems to have hanging apt-get and/or dpkg processes, so kill