test: Add TestValidateRemoteURL for ValidateRemoteURL
test: Add TestValidateRemoteURL for ValidateRemoteURL

Golang 1.8 has new implement for `url.Parse`, which may break `ValidateRemoteUrl`.

ValidateRemoteURL("git@github.com:git-lfs/git-lfs")) will return an error
like: "first path segment in URL cannot contain colon".

Signed-off-by: Jiang Xin <6bb97c20172014585c1cb9cfa7ac10e0c9ba0ecd@huawei.com>

Jericho25/-git-lfs_miilkyway,aleb/git-lfs,andyneff/git-lfs,github/git-lfs,andyneff/git-lfs,dakotahawkins/git-lfs,aleb/git-lfs,Jericho25/-git-lfs_miilkyway,aleb/git-lfs,dakotahawkins/git-lfs,andyneff/git-lfs,Jericho25/-git-lfs_miilkyway,github/git-lfs,github/git-lfs,dakotahawkins/git-lfs