OpenFlow 1.0: Lose 7 ND_TCHECK_LEN() calls.

Considering a protocol field that has a known size and contains a
zero-padded string, in a code of this particular form:

ND_TCHECK_LEN(field_start, field_length);
nd_print(ndo, field_start, field_start + field_length);

...the only effect of the ND_TCHECK_LEN() call is that when the protocol
field is not entirely within the packet buffer, the code before
triggering a longjmp() prints nothing instead of printing the part of
the field that is within the packet buffer. Thus remove these instances
of ND_TCHECK_LEN(), so the output better represents the captured data.

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