Looks like a few commits got lost in the merge 31f56fbd94, restoring them:
Andreas Beckmann (4):
Revert "Revert "p: ensure /etc/mtab exists in the chroot""
Revert "Revert "fix the nsswitch.conf upgrade workarounds""
Revert "Revert "add bug template for wheezy -> jessie -> stretch
upgrades""
update database handling for fusionforge packages
Andreas