Fix some issues reported by lintian

Fix some issues reported by lintian

• Trim trailing whitespace. (trailing-whitespace)

• Use secure copyright file specification URI. (insecure-copyright-format-uri)

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

• Add missing ${misc:Built-Using} to Built-Using on cockroachdb-datadriven. (missing-built-using-field-for-golang-package)

• 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 (out-of-date-standards-version)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/golang-github-cockroachdb-datadriven/35d9c310-7ab8-4579-bf36-fea9f2d772e7.

Debdiff

These changes affect the binary packages:

File lists identical (after any substitutions)

Control files of package cockroachdb-datadriven: lines which differ (wdiff format)

• Built-Using: golang-github-pmezard-go-difflib (= 1.0.0-3)

No differences were encountered between the control files of package **golang-github-cockroachdb-datadriven-dev**

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