LU-6353 contrib: Remove wireshark plugin

Wireshark dissection has been pushed upstream:
https://code.wireshark.org/review/24795 [lnet]
https://code.wireshark.org/review/24800 [lustre]

Both patches have landed to wireshark master.

Dissectors were ported to wireshark master and significantly expaneded
and cleaned up.

Test-Parameters: trivial

Lustre-change: https://review.whamcloud.com/30602


Lustre-commit: 4b5206bc

Signed-off-by: Nathaniel Clark <nathaniel.l.clark@intel.com>
Change-Id: I0a9d54634599cdb7f9169f1186c58fa96666b246
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Reviewed-by: Doug Oucharek <dougso@me.com>
Signed-off-by: Minh Diep <minh.diep@intel.com>
Reviewed-on: https://review.whamcloud.com/31258


Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: John L. Hammond <john.hammond@intel.com>