support for non https remotes

[hjanuschka]

hey, thx for this awesome plugin ❤️

we have a gitlab instance running without https -> don't ask!

here is the required change to support the http protocol (and keep the default https; works for all remotes)

config sample:

{
    "gitlens.remotes": [{ "domain": "gitlab.xxxx.at", "type": "GitLab", "protocol": "http" }]
}

let me know if there is something to change/adapt.

[eamodio]

@hjanuschka Thanks for the contribution, I will get this merged into GitLens 6 which is likely coming out tomorrow!