vm/qubes-dom0-update: rebuild dom0 rpmdb before touching it with yum
vm/qubes-dom0-update: rebuild dom0 rpmdb before touching it with yum

Dom0 can have different (older) rpmdb version than VM. Starting from FC17 yum
refuses to work without rebuild.

QubesOS/qubes-core-admin,QubesOS/qubes-core-admin,marmarek/qubes-core-admin,marmarek/qubes-core-admin,woju/qubes-core-admin,woju/qubes-core-admin,woju/qubes-core-admin,QubesOS/qubes-core-admin,marmarek/qubes-core-admin,woju/qubes-core-admin