wnpp-check: Replace non-HTTPs URLs with HTTPs URLs

Kumarrequested to merge
kumar/devscripts:fix/wnpp-check into master

If "wget" isn't installed in the system, "wnpp-check" command returns an empty output. Despite being "curl" installed in the system and WNPP is present for the package. As soon as we install "wget" package, everything works fine. This happens because unlike "wget", by default "curl" doesn't follow HTTP redirections. And on use of non-HTTPs URL, (debian.org) server returns a HTTP 302 header, see bug report log #1002311 for more information.

Using HTTPs URLs, we avoid a HTTP redirections and program works as expected.

Resolves: #1002311, #902242

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