URI::InvalidURIError: bad URI(absolute but no path): ssh:

Looks like the URI masker doesn't work well with SSH URIs.

/cc: @brodock

-Stan

https://sentry.gitlap.com/gitlab/gitlabcom/issues/5059/

URI::InvalidURIError: bad URI(absolute but no path): ssh:
  lib/gitlab/url_sanitizer.rb:10:in `initialize'
    @url = URI.parse(URI.encode(url))
  lib/gitlab/url_sanitizer.rb:6:in `new'
    content.gsub(regexp) { |url| new(url).masked_url }
  lib/gitlab/url_sanitizer.rb:6:in `block in sanitize'
    content.gsub(regexp) { |url| new(url).masked_url }
  lib/gitlab/url_sanitizer.rb:6:in `gsub'
    content.gsub(regexp) { |url| new(url).masked_url }
  lib/gitlab/url_sanitizer.rb:6:in `sanitize'
    content.gsub(regexp) { |url| new(url).masked_url }
...
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