Implement character pushback and state to ground without packet disposal...

...for most packet types.  Attempting to make *all* character pushbacks do this
breaks the following tests:

test/daemon/ac12_binary.log
test/daemon/gp-320fw-2019-04-07-coldboot.log
test/daemon/naujoks-ntrip.log
test/daemon/naujoks-rtcm2.log
test/daemon/rtcm2.log
test/daemon/triton400.log

Someday we should figure out why, but it is not very urgent as the
capability is mostly just useful for faster recovery from garbage
data on the wire.

However, this change does have significant impact on the test framework.
It should make recognition of the "# EOF\r\n" token injected by gpsfake
reliable even in a binary packet stream.

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