Fix some issues reported by lintian

Fix some issues reported by lintian

• Bump debhelper from old 11 to 13. (package-uses-old-debhelper-compat-version)
• Set debhelper-compat version in Build-Depends. (uses-debhelper-compat-file)
• Set upstream metadata fields: Bug-Database, Bug-Submit, Repository-Browse. (upstream-metadata-file-is-missing, upstream-metadata-missing-bug-tracking)
• Drop unnecessary dependency on dh-autoreconf.
• Update standards version to 4.6.2, no changes needed. (out-of-date-standards-version)
• Set upstream metadata fields: Repository. (upstream-metadata-missing-repository)

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/2c/bac5d45f2a991901f24aa4413e9310aae003b3.debug

Files in first set of .debs but not in second

-rw-r--r--  root/root   /usr/lib/debug/.build-id/6c/a1a79a93591abf9f39e9a5dcff45198bc98a8c.debug

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

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

• Build-Ids: 6ca1a79a93591abf9f39e9a5dcff45198bc98a8c 2cbac5d45f2a991901f24aa4413e9310aae003b3

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