Revert "depsolve: filter out conflicting provider. BZ 1480065"

This didn't handle the case where *all* of the providers conflict with
reqpo and therefore produce an empty pkgs list on which we later call
max() and traceback.  I'll rework this in the next commit.

This reverts commit ae2d51b.

yum/depsolve.py

@@ -1556,13 +1556,6 @@ def _pkg2prov_version(pkg, provname):
  continue
  unique_nevra_pkgs[pkg.pkgtup] = pkg
  pkgs = unique_nevra_pkgs.values()
-
- # Do a conflict filtering; get rid of those pkgs that reqpo conflicts
- # with
- if reqpo is not None:
- pkgs = [pkg for pkg in pkgs
- if not any(pkg.checkPrco('provides', conflict)
- for conflict in reqpo.conflicts)]
 
  pkgresults = {}