Fix some issues reported by lintian

Fix some issues reported by lintian

• Re-export upstream signing key without extra signatures. (public-upstream-key-not-minimal)
• Set upstream metadata fields: Bug-Database, Bug-Submit. (upstream-metadata-missing-bug-tracking)

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/09/a7482f249c4fa27c60ec1458e5eb333bb36b77.debug
-rw-r--r--  root/root   /usr/lib/debug/.build-id/16/7d56fd9910400532c54af9ba450339a0190630.debug
-rw-r--r--  root/root   /usr/lib/debug/.build-id/8b/b07c5845c42c95a36f4aa49ab758b16e034dd1.debug

Files in first set of .debs but not in second

-rw-r--r--  root/root   /usr/lib/debug/.build-id/3e/154c831c596ac4efe13543329039088bc4259d.debug
-rw-r--r--  root/root   /usr/lib/debug/.build-id/61/abc56c90a375be4f56713e083191d2d84c90a7.debug
-rw-r--r--  root/root   /usr/lib/debug/.build-id/66/94a2d6f86a023ac4d2d2c6547db0f8c685a666.debug

No differences were encountered between the control files of package **kpartloader**

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

• Build-Ids: 3e154c831c596ac4efe13543329039088bc4259d 8bb07c5845c42c95a36f4aa49ab758b16e034dd1

No differences were encountered between the control files of package **kuiviewer**

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

• Build-Ids: 09a7482f249c4fa27c60ec1458e5eb333bb36b77 167d56fd9910400532c54af9ba450339a0190630 4d28302ec41512262c6d0d3c7f323dad36529ad0 61abc56c90a375be4f56713e083191d2d84c90a7 6694a2d6f86a023ac4d2d2c6547db0f8c685a666

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Build and test logs for this branch can be found at https://janitor.debian.net/run/31842523-fd49-495a-95f8-24dd8b558a8c.