Fix some issues reported by lintian

Fix some issues reported by lintian

• Bump debhelper from old 12 to 13. (package-uses-old-debhelper-compat-version)

• Set field Upstream-Contact in debian/copyright.

• Set upstream metadata fields: Bug-Database, Bug-Submit, Repository. (upstream-metadata-missing-bug-tracking)

• Remove obsolete fields Contact, Name from debian/upstream/metadata (already present in machine-readable debian/copyright).

• Update standards version to 4.6.1, no changes needed. (out-of-date-standards-version)

This merge proposal was created automatically by the Janitor bot. For more information, including instructions on how to disable these merge proposals, see https://janitor.debian.net/lintian-fixes.

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Build and test logs for this branch can be found at https://janitor.debian.net/lintian-fixes/pkg/dhcpoptinj/b8adfa5e-0cdd-4a2f-b1f4-8fc3e8fbdcd3.

Debdiff

These changes affect the binary packages:

[The following lists of changes regard files as different if they have different names, permissions or owners.]

Files in second set of .debs but not in first

-rw-r--r--  root/root   /usr/lib/debug/.build-id/f0/90da8100171f2909a3b894651d9078bcb1b844.debug

Files in first set of .debs but not in second

-rw-r--r--  root/root   /usr/lib/debug/.build-id/59/a8d8493acdd7121f02e14be24fefd8aa611aed.debug

Control files of package dhcpoptinj: lines which differ (wdiff format)

• Depends: libc6 (>= 2.14), 2.34), libnetfilter-queue1 (>= 1.0.0)

Control files of package dhcpoptinj-dbgsym: lines which differ (wdiff format)

• Build-Ids: 59a8d8493acdd7121f02e14be24fefd8aa611aed f090da8100171f2909a3b894651d9078bcb1b844

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