Add -I option in editcap to extend Duplicate packet removal
Description:
Ignore the specified bytes number at the beginning of the frame during MD5 hash calculation.
Useful to remove duplicated packets taken on several routers or SW(differents mac addresses for example).
e.g. -I 26 in case of Ether/IP/ will ignore ether(14) and IP header(20 - 4(src ip) - 4(dst ip)).
The default value is 0.
This option is only relevant when used with -d|-D|-w

Bug: 8511
Change-Id: I009a09d32778a182b2d88f372651f658a4938882
Reviewed-on: https://code.wireshark.org/review/4104
Tested-by: Evan Huus <eapache@gmail.com>
Reviewed-by: Evan Huus <eapache@gmail.com>