Update rpm to rev 278 via SR 787932
https://build.opensuse.org/request/show/787932
by user mlschroe + dimstar_suse
Follow one level of symlink indirection when converting the rpm database [bnc#1167537]
Note that this is IMPORTANT and should go into Factory fast: without
it, updates to Tumbleweed may end up with a broken rpm database.
See bugzilla 1167537 for the gory details.