Fix some issues reported by lintian

Fix some issues reported by lintian

• Trim trailing whitespace. (trailing-whitespace)
• Set upstream metadata fields: Archive, Bug-Database, Bug-Submit, Contact, Name, Repository-Browse. (upstream-metadata-file-is-missing, upstream-metadata-missing-bug-tracking)
• Fix day-of-week for changelog entries 0.5.5-3, 0.5.5-2, 0.5.5-1, 0.5.2-2, 0.5.2-1. (debian-changelog-has-wrong-day-of-week)

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Build and test logs for this branch can be found at https://janitor.debian.net/lintian-fixes/pkg/rmysql/d1df478a-9850-4582-8a9e-53f39aa0824c.

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/d8/52e22b872b5ef8b72c6506fb45d6a35e47db10.debug

Files in first set of .debs but not in second

-rw-r--r--  root/root   /usr/lib/debug/.build-id/7d/7be9142fb09c47aa1b90a873245827eb7ccee8.debug

No differences were encountered between the control files of package **r-cran-rmysql**

Control files of package r-cran-rmysql-dbgsym: lines which differ (wdiff format)

• Build-Ids: 7d7be9142fb09c47aa1b90a873245827eb7ccee8 d852e22b872b5ef8b72c6506fb45d6a35e47db10

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