(MCO-366) Remove Sid/Unstable from build defaults

This commit goes through the build_defaults.yaml and removes the sid and
unstable entries. Part of the reason for this removal is we don't test
against sid but release it and we build packages for debian-testing.
(MCO-181) Add --[no-]daemonize flag to mcollectived

Adds the daemonize flag. This flag will override the value defined in
the config file allowing init scripts etc to tell mcollectived whether
it should daemonize or not.
Merge pull request #201 from clantant/MCO-366/master/sid

(MCO-366) Remove Sid/Unstable from build defaults
Merge pull request #202 from ploubser/mco-181

(MCO-181) Add --[no-]daemonize flag to mcollectived