MFC r311744,r312328,r312329,r312330:

r311744:

Document bsd.snmpmod.mk from a high-level

r312328:

Add a make target (smilint) for running smilint tool against BMIBS

Running smilint against MIB definitions is useful in finding
functional problems with MIB definitions/descriptions.

This is inspired by the smilint targets defined in
usr.sbin/bsnmpd/modules/{snmp_hostres,snmp_mibII}/Makefile

Document all of the variables that are involved in running the
smilint target, as well as all of the prerequisites to running
it.

r312329:

Remove ad hoc smilint targets made standard in bsd.snmpmod.mk in r312328

r312330:

Add smilint target to subdir targets so "make smilint" here will run
the smilint target in subdirs

While here, convert a path that's .CURDIR relative to SRCTOP

MFstable/11 r311212:

MFC r310665:

Only build/install usr.sbin/bsnmpd/modules/snmp_hast if MK_HAST != no

MFstable/11 r311209:

MFC r310664:

Only build/install usr.sbin/bsnmpd/modules/snmp_wlan if MK_WIRELESS != no

Bulk sync of pf changes from head, in attempt to fixup broken build I
made in r263029.

Merge r257186,257215,257349,259736,261797.

These changesets split pfvar.h into several smaller headers and make
userland utilities to include only some of them.

Bulk sync of pf changes from head, in attempt to fixup broken build I
made in r263029.

Merge r257186,257215,257349,259736,261797.

These changesets split pfvar.h into several smaller headers and make
userland utilities to include only some of them.