resolve deps before running scheduler #336

resolve deps before running scheduler #336

This is refinement about current scheduler to speed up resolve
dependency. Generate %pkgdeps, which is a map with key as pkgname,
and value is a list of dependencies. %pkgdeps can be used directly
by scheduler and don't need parse spec file everytime.

This patch also update %pkgdeps once local repo has been updated.

This also can fix #336, #337.

Change-Id: I6289a8df14d8cb027c6f6494efb4f45910d24fe2