Build and install from GOPATH

* Rename 'vendor/src' -> 'vendor'
  * Ignore vendor/ instead of vendor/src/ for lint
* Rename 'cmd/client' -> 'cmd/ocic' to make it 'go install'able
* Rename 'cmd/server' -> 'cmd/ocid' to make it 'go install'able
* Update Makefile to build and install from GOPATH
* Update tests to locate ocid/ocic in GOPATH/bin
* Search for binaries in GOPATH/bin instead of PATH
* Install tools using `go get -u`, so they are updated on each run

Signed-off-by: Jonathan Yu <jawnsy@redhat.com>

vendor/github.com/docker/go-connections/sockets/sockets.go

@@ -0,0 +1,38 @@
+// Package sockets provides helper functions to create and configure Unix or TCP sockets.
+package sockets
+
+import (
+	"errors"
+	"net"
+	"net/http"
+	"time"
+)
+
+// Why 32? See https://github.com/docker/docker/pull/8035.
+const defaultTimeout = 32 * time.Second
+
+// ErrProtocolNotAvailable is returned when a given transport protocol is not provided by the operating system.
+var ErrProtocolNotAvailable = errors.New("protocol not available")
+
+// ConfigureTransport configures the specified Transport according to the
+// specified proto and addr.
+// If the proto is unix (using a unix socket to communicate) or npipe the
+// compression is disabled.
+func ConfigureTransport(tr *http.Transport, proto, addr string) error {
+	switch proto {
+	case "unix":
+		return configureUnixTransport(tr, proto, addr)
+	case "npipe":
+		return configureNpipeTransport(tr, proto, addr)
+	default:
+		tr.Proxy = http.ProxyFromEnvironment
+		dialer, err := DialerFromEnvironment(&net.Dialer{
+			Timeout: defaultTimeout,
+		})
+		if err != nil {
+			return err
+		}
+		tr.Dial = dialer.Dial
+	}
+	return nil
+}