Don't take devmtx unnecessarily in vn_isdisk.

MFC after:	1 week
Add inet/inet6 to the dependency list. Without them if_gif is useless.

MFC after:	1 month
Silence down a warning that doesn't provide any useful information unless
debug is enabled.

MFC after:	1 month
Sponsored by:	The FreeBSD Foundation
As pointed out by several people, r273114 was incorrect: it unconditionally
disabled everything except TLS 1.0.  Replace it with a more carefully
wrought patch:

 - Switch the default for SSLv3 from on to off
 - Add environment variables to control TLS 1.1 and 1.2
 - In verbose mode, report which version is used
 - Update the man page to reflect these changes.

MFC after:	1 week
Make automountd(8) inform autofs(4) whether directory being handled can
have wildcards.  This makes it possible for autofs(4) to avoid requesting
automountd(8) action on access to nonexistent nodes - unless wildcards
are actually used.

Note that this change breaks ABI for automountd(8).

Tested by:	dhw@
MFC after:	1 month
Sponsored by:	The FreeBSD Foundation