lint.py: add checks for https:// in various URLs

lint.py: add checks for https:// in various URLs

Many times, the http:// URL automatically redirects to https://, like with
github and gitorious.  For git repos, using https:// reduces metadata
leakage for more privacy, and increases the security a little bit.  For SVN
repos, using https:// is much more important since the repo format itself
does not provide the same level of verification as git, hg, etc. do.