Remove etcd unit testing from travis (#2672)

* Remove etcd unit testing from travis

Remove these from the travis unit testing. (to speed up travis)

See #2671

Signed-off-by: Miek Gieben <miek@miek.nl>

* Add build tag

Signed-off-by: Miek Gieben <miek@miek.nl>

plugin/etcd/setup_test.go

@@ -1,3 +1,5 @@
+// +build etcd
+
 package etcd
 
 import (
@@ -126,6 +128,5 @@ func TestSetupEtcd(t *testing.T) {
 				}
 			}
 		}
-
 	}
 }