Fixes the following Lintian 2.15.0 (Debian sid) warnings with WS 3.0.2:
W: wireshark-common: extended-description-line-too-long
W: wireshark-common: command-with-path-in-maintainer-script postrm:11 /usr/sbin/delgroup
W: wireshark-dbg: priority-extra-is-replaced-by-priority-optional
W: wireshark-doc: priority-extra-is-replaced-by-priority-optional
Replace absolute path test in postrm and fix indentation.
Remove the Priority line in binary packages since they default to the
Source priority which is set to "optional". See
https://www.debian.org/doc/debian-policy/ch-archive.html#s-priorities
Change-Id: Ib07f6414348cbbfb1e7177643d9b9acfd9f1a477
Reviewed-on: https://code.wireshark.org/review/33675
Reviewed-by: Alexis La Goutte <alexis.lagoutte@gmail.com>