Code review comment for ~simpoir/ubuntu/+source/landscape-client:focal_pulse

and also take advantage of this upload to modernise the package which is deprecated to some regards.

lintian report:

$ lintian --pedantic -I landscape-client_18.01-0ubuntu9.dsc
P: landscape-client source: package-uses-deprecated-source-override-location
P: landscape-client source: file-contains-trailing-whitespace debian/changelog (line 327)
P: landscape-client source: file-contains-trailing-whitespace debian/changelog (line 490)
P: landscape-client source: file-contains-trailing-whitespace debian/changelog (line 493)
P: landscape-client source: file-contains-trailing-whitespace ... use --no-tag-display-limit to see all (or pipe to a file/program)
I: landscape-client source: debian-pycompat-is-obsolete
W: landscape-client source: package-uses-deprecated-debhelper-compat-version 7
P: landscape-client source: rules-requires-root-missing
P: landscape-client source: no-dep5-copyright
I: landscape-client source: no-complete-debconf-translation
I: landscape-client source: debian-rules-parses-dpkg-parsechangelog (line 20)
P: landscape-client source: no-homepage-field
W: landscape-client source: ancient-standards-version 3.8.2 (released 2009-06-16) (current is 4.4.0)
W: landscape-client source: ancient-python-version-field x-python3-version 3.5
I: landscape-client source: testsuite-autopkgtest-missing

- Eric