[Bug 260921] /bin/df: make -l and -t nonexclusive, allow multiple -t options

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=260921

            Bug ID: 260921
           Summary: /bin/df: make -l  and -t nonexclusive, allow multiple
                    -t options
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Keywords: feature
          Severity: Affects Some People
          Priority: ---
         Component: bin
          Assignee: bugs@FreeBSD.org
          Reporter: pauamma@gundo.com

df currently rejects using both -l and -t, thus making it impossible to ask for
free space on some but not all local filesystems as the sysinfo plugin in
irc/hexchat tries to.

Following an IRC discussion with kevans, the following tentative specification
emerged:

1- make it possible to use -l and -t nofoo together to select all local
filesystems except those of type foo.
2- (suggested by kevans) make it possible to use -l and -t foo together to
select all local filesystems and those of type foo (eg, local and NFS but not
Samba).

kevans also suggested allowing multiple -t options, both additive and
subtractive) but I think the meaning of that needs more discussion (and it
arguably breaks the POLA) so I'm not including it in this change request.

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