MFC r264539:

 When switching variables to flags in r243185 a few cases were missed.
 After r263152 (in head) this leaves unused variables if route(8) is
 compiled without INET support.
 Switch the remaining variable accesses to flags and remove now obsolete
 variables.

 Reviewed by:	glebius
MFC r266596:

 Move the tcp_fields_to_host() and tcp_fields_to_net() (inline)
 functions to the tcp_var.h header file in order to avoid further
 duplication with upcoming commits.

 Reviewed by:	np
MFC r266597:

 Remove the prototypes for things that are no longer file local but were
 moved to the header file.

 Was suppoed to be MFCed with: r266596
 Pointy hat to:	bz
MFC r266606:

 Only do a ports check if this is a NAT-T SA.  Otherwise other
 lookups providing ports may get unexpected results.
MFC r266618:

 Make tcp_twrespond() file local private;  this removes it from the
 public KPI; it is not used anywhere else and seems it never was.
MFC r266619:

 syncache_lookup() is a file local function.  Make it static and
 take it out of the public KPI; seems it was never used elsewhere.
MFC r266620:

 Remove the prototpye for the static inline function
 tcp_signature_verify_input().
 The function is defined before first use already.
MFC r266907:

 While PAWS is disabled, there are no consumers for the tcp options
 argument to tcp_twcheck();  thus mark it __unused.
MFC r264605:

 Based on xlp_machdep.c and completed the list of options based on
 boot/mips/beri/loader/metadata.c allow FDT configuration to set
 command line options.
 This leads to an interesting quesiton of future interactions with loader.
 However for configurations without loader this allows bootverbose or boot
 single user to be set by compiling a new kernel, which is good enough for
 testing and debugging.

 Reviewed by:	rwatson
Sponsored by:	DARPA/AFRL
MFC r264542:

 Use ETHER_ALIGN as argument to m_adj() to offset the beginning of packet
 rather than the magic number 2.

 While here fix a typo in a comment.

 No functional changes.

Sponsored by:	DARPA/AFRL
MFC r263632:

 For BERI on NetFPGA assume HZ=100 by default.

 Remove the uart support in favour of a "jtag-uart" interface imitation
 providing a much simpler interface, directly exported to the host,
 allowing the toolchain to be shared with BERI on Altera. [1]

 Submitted by:	Jong Hun HAN (jong.han cl.cam.ac.uk) [1]
Sponsored by:	DARPA/AFRL