Fix some issues reported by lintian

Fix some issues reported by lintian

• Trim trailing whitespace. (trailing-whitespace)
• Use secure URI in Homepage field. (homepage-field-uses-insecure-uri)
• Re-export upstream signing key without extra signatures. (public-upstream-key-not-minimal)
• Update standards version to 4.6.1, no changes needed. (out-of-date-standards-version)
• Update standards version to 4.6.2, no changes needed. (out-of-date-standards-version)

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/5f/c786a5f2e79f2d1e79bfe50f151351a87f7670.debug
-rw-r--r--  root/root   /usr/lib/debug/.build-id/cf/d367607d3c8a92b2deba0d06470599cc12d3ba.debug

Files in first set of .debs but not in second

-rw-r--r--  root/root   /usr/lib/debug/.build-id/7a/f3288e8052464cb8be8cab1ebde0f76b17a678.debug
-rw-r--r--  root/root   /usr/lib/debug/.build-id/81/54d7cbb18db2ca4c2c1b7931df1f84c302db4f.debug

Control files of package virt-viewer: lines which differ (wdiff format)

• Homepage: http​://virt-manager.org https​://virt-manager.org

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

• Build-Ids: 7af3288e8052464cb8be8cab1ebde0f76b17a678 8154d7cbb18db2ca4c2c1b7931df1f84c302db4f 5fc786a5f2e79f2d1e79bfe50f151351a87f7670 cfd367607d3c8a92b2deba0d06470599cc12d3ba

You can also view the diffoscope diff (unfiltered).

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Build and test logs for this branch can be found at https://janitor.debian.net/run/12004296-ce24-4b65-81f3-a0bfe09fa973.