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/containers/storage/pkg/directory/directory.go

@@ -0,0 +1,26 @@
+package directory
+
+import (
+	"io/ioutil"
+	"os"
+	"path/filepath"
+)
+
+// MoveToSubdir moves all contents of a directory to a subdirectory underneath the original path
+func MoveToSubdir(oldpath, subdir string) error {
+
+	infos, err := ioutil.ReadDir(oldpath)
+	if err != nil {
+		return err
+	}
+	for _, info := range infos {
+		if info.Name() != subdir {
+			oldName := filepath.Join(oldpath, info.Name())
+			newName := filepath.Join(oldpath, subdir, info.Name())
+			if err := os.Rename(oldName, newName); err != nil {
+				return err
+			}
+		}
+	}
+	return nil
+}

vendor/github.com/containers/storage/pkg/directory/directory_unix.go

@@ -0,0 +1,48 @@
+// +build linux freebsd solaris
+
+package directory
+
+import (
+	"os"
+	"path/filepath"
+	"syscall"
+)
+
+// Size walks a directory tree and returns its total size in bytes.
+func Size(dir string) (size int64, err error) {
+	data := make(map[uint64]struct{})
+	err = filepath.Walk(dir, func(d string, fileInfo os.FileInfo, err error) error {
+		if err != nil {
+			// if dir does not exist, Size() returns the error.
+			// if dir/x disappeared while walking, Size() ignores dir/x.
+			if os.IsNotExist(err) && d != dir {
+				return nil
+			}
+			return err
+		}
+
+		// Ignore directory sizes
+		if fileInfo == nil {
+			return nil
+		}
+
+		s := fileInfo.Size()
+		if fileInfo.IsDir() || s == 0 {
+			return nil
+		}
+
+		// Check inode to handle hard links correctly
+		inode := fileInfo.Sys().(*syscall.Stat_t).Ino
+		// inode is not a uint64 on all platforms. Cast it to avoid issues.
+		if _, exists := data[uint64(inode)]; exists {
+			return nil
+		}
+		// inode is not a uint64 on all platforms. Cast it to avoid issues.
+		data[uint64(inode)] = struct{}{}
+
+		size += s
+
+		return nil
+	})
+	return
+}

vendor/github.com/containers/storage/pkg/directory/directory_windows.go

@@ -0,0 +1,37 @@
+// +build windows
+
+package directory
+
+import (
+	"os"
+	"path/filepath"
+)
+
+// Size walks a directory tree and returns its total size in bytes.
+func Size(dir string) (size int64, err error) {
+	err = filepath.Walk(dir, func(d string, fileInfo os.FileInfo, err error) error {
+		if err != nil {
+			// if dir does not exist, Size() returns the error.
+			// if dir/x disappeared while walking, Size() ignores dir/x.
+			if os.IsNotExist(err) && d != dir {
+				return nil
+			}
+			return err
+		}
+
+		// Ignore directory sizes
+		if fileInfo == nil {
+			return nil
+		}
+
+		s := fileInfo.Size()
+		if fileInfo.IsDir() || s == 0 {
+			return nil
+		}
+
+		size += s
+
+		return nil
+	})
+	return
+}