Fix various packager issues. Add options to global_config
1. Fix missing default values for PACKAGER/minimum_free_space and
PACKAGER/custom_max_age. These prevented the packager from running on a
fresh installation.
2. Add values mentioned in 1 to global_config for easier discovery.
3. Modify trim_custom_directories behavior to use the default value only
when one is not provided to the function.
4. Various spelling and style cleanup.
Not completely the same, but similar change review URL:
http://gerrit.chromium.org/gerrit/#change,3701
Signed-off-by: Dale Curtis <dalecurtis@google.com>
git-svn-id: svn://test.kernel.org/autotest/trunk@5492 592f7852-d20e-0410-864c-8624ca9c26a4