Prime the epan_dissect_t with postdissector wanted fields if necessary.

This makes sure that postdissectors that indicate that they need certain
fields in the first pass will get them.

While we're at it:

Fix the field-fetching code in TRANSUM not to assume it got any
instances of the field being fetched.

Rename process_packet_first_pass() in sharkd to process_packet(), as
it's the only routine in sharkd that processes packets.

Rename process_packet() in tshark and tfshark to
process_packet_single_pass(), as it's what's used if we're only doing
one-pass analysis.

Clean up comments and whitespace.

Change-Id: I3769af952c66f5ca4b68002ad6213858ab9cab9b
Reviewed-on: https://code.wireshark.org/review/21063
Reviewed-by: Guy Harris <guy@alum.mit.edu>

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