Add some tooling to package tcollector as an Arista EOS extension.

Change-Id: Ie8dd3a1c96f877f220148779624ec39db6bdf69d
Make BSD sed happy.

Change-Id: I1039fd6abdcb6c009798c40d57ea13d25dacbf91
Specify an RPM group to make rpmbuild < 4.6 happy.
Rename directory for building RPM.
Build two RPMs: one for Linux (RedHat/CentOS/Fedora), one for EOS.
Disable some RPM crap from distros.
Fix file permissions in RPM.
Install an init.d script.
Add install/uninstall hooks to register tcollector.
Do not consider non-executable files as collectors.
Add a -D/--daemonize flag to tcollector.
Fix path to tcollector in init.d script.

Change-Id: Ia91e1f0b493b8df1b0177b7d27349a83636d9223