doc: adjust release date
Merge branch 'v7-stable' into v7-devel

Conflicts:
	ChangeLog
Add directives for numerically specifying GIDs/UIDs

The already present directives (FileOwner, FileGroup, DirOwner,
DirGroup) translate names to numerical IDs, which depends on the user
information being available during rsyslog's startup. This can fail if
the information is obtained over a network or from a service such as
SSSD. The new directives provide a way to specify the numerical IDs
directly and bypass the lookup.
doc: maintain ChangeLog