testsuite: Fixed several pylint 1.0 issues
POSIX: Fix verification of symlinks

* Stat the link itself, not its target
* Get SELinux context from the link, not the target
* Don't get ACLs at all; symlinks don't have their own ACLs

The first issue listed wasn't actually a bug, because none of the
information queried from the target by the stat call was actually used
in verification, but it's been fixed for completeness.
Yum: only fork to find bcfg2-yum-helper once, for real
Yum: fix pylint tests
Fixed typo

Note to self: do not push code before 9 am
Metadata: reread client list from database

This fixes two related bugs: One causes Metadata to use an out-of-date
cached list of clients when a client is deleted or added with
bcfg2-admin; the other causes child worker processes to use an
out-of-date cached list of clients when a client is added with a Bcfg2
run when the multiprocessing core is in use.
bcfg2-lint: Verify abstract Package tags
helpers: better error message when failing to read FileBacked
redhat: fixed killproc behavior when multiprocessing core doesn't shut down properly
bcfg2.spec: Fix changelog date order

Signed-off-by: Sol Jerome <sol.jerome@gmail.com>
Version bump to 1.3.4

Signed-off-by: Sol Jerome <sol.jerome@gmail.com>