Bring pkg-update into line with current practice
Bring pkg-update into line with current practice

   - No more PKG_MULTIREPOS
   - Repo catalogue updates are normally automatic
   - Unless disabled by REPO_AUTOUPDATE being false

Open343/pkg,khorben/pkg,junovitch/pkg,junovitch/pkg,khorben/pkg,Open343/pkg,khorben/pkg,skoef/pkg,skoef/pkg,en90/pkg,en90/pkg