Unable to push to a repo that has a git URI format

[mireilleanwar]

push to a repo that has this URI format git@accountname:/reponame.git fails with error "An error was raised by libgit2. Category = Net (Error).This transport isn't implemented. Sorry"

[carlosmn]

This is not a git URI, this is a SSH URL, which we currently don't implement, as the error message says.

Duplicate of #1103, and due to the error message, it looks like a duplicate of libgit2/libgit2sharp#255