Add integration tests for private.NoServCommand and private.ServCommand (#17456)
Add integration tests for private.NoServCommand and private.ServCommand (#17456)

modules/private/serv.go has two major functions that are missing testcases to ensure
that Deploy and normal SSH keys work correctly.

This PR adds some basic integration tests for these.

Signed-off-by: Andrew Thornton <6a547fdd28db89120bdd70d4af1f9ba672ccd43a@cantab.net>
go-gitea/gitea,go-gitea/gitea,go-gitea/gitea