Fix some issues reported by lintian

Fix some issues reported by lintian

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

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 (out-of-date-standards-version)

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Build and test logs for this branch can be found at https://janitor.debian.net/lintian-fixes/pkg/libnss-nis/653e33e3-ea1b-4576-a342-8722f8887569.

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/a2/2fdef8a949a5117d8d5aeb98b83c0cab8beb49.debug

Files in first set of .debs but not in second

-rw-r--r--  root/root   /usr/lib/debug/.build-id/02/898aab4ff1d3402a6c6cd1b95dc33044543173.debug

Control files of package libnss-nis: lines which differ (wdiff format)

• Depends: libc6 (>= 2.14), 2.34), libnsl2 (>= 1.0)

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

• Build-Ids: 02898aab4ff1d3402a6c6cd1b95dc33044543173 a22fdef8a949a5117d8d5aeb98b83c0cab8beb49

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