Copy stable/11@r303970 to releng/11.0 as part of the 11.0-RELEASE
cycle.

Prune svn:mergeinfo from the new branch, and rename it to RC1.

Update __FreeBSD_version.

Use the quarterly branch for the default FreeBSD.conf pkg(8) repo and
the dvd1.iso packages population.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Copy head@r302406 to stable/11 as part of the 11.0-RELEASE cycle.
Prune svn:mergeinfo from the new branch, as nothing has been merged
here.

Additional commits post-branch will follow.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Use the canonical include name for snmpmod.h. The build infrastructure takes
already care to pick up the correct version of the file depending on how
we build.

The ticks delivered by the SNMP daemon are now 64-bit, so make our
local tick variable which is used to reduce the number of updates from
kernel structures and to ensure intra-PDU consistency also 64 bit.

Compare with 0 if comparing an integer, not with NULL.

Style: remove an empty line.

Replace all uses of the old netgraph constants NG_*LEN by the new
constants NG_*SIZ that include the trailing NUL byte. This change
is mostly mechanical except for the replacement of a couple of snprintf()
and sprintf() calls with strlcpy.

Add build infrastructure for libbsnmp and the modules. Add the
netgraph module for the SNMP daemon.