first pass on a table to list all apt sources

Conflicts:
	osquery/tables/CMakeLists.txt
	tools/provision.sh
merging apt_sources table
free dpkg db so we can run this query multiple times
slightly less leaky apt_sources
Merge branch 'apt_sources'
Merge branch 'deb_packages_table'
whitespace tweak
Merge branch 'deb_packages_table'