Vendor in container storage

This should add quota support to cri-o

Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>

vendor/github.com/containers/storage/pkg/locker/README.md

@@ -0,0 +1,65 @@
+Locker
+=====
+
+locker provides a mechanism for creating finer-grained locking to help
+free up more global locks to handle other tasks.
+
+The implementation looks close to a sync.Mutex, however, the user must provide a
+reference to use to refer to the underlying lock when locking and unlocking,
+and unlock may generate an error.
+
+If a lock with a given name does not exist when `Lock` is called, one is
+created.
+Lock references are automatically cleaned up on `Unlock` if nothing else is
+waiting for the lock.
+
+
+## Usage
+
+```go
+package important
+
+import (
+	"sync"
+	"time"
+
+	"github.com/containers/storage/pkg/locker"
+)
+
+type important struct {
+	locks *locker.Locker
+	data  map[string]interface{}
+	mu    sync.Mutex
+}
+
+func (i *important) Get(name string) interface{} {
+	i.locks.Lock(name)
+	defer i.locks.Unlock(name)
+	return data[name]
+}
+
+func (i *important) Create(name string, data interface{}) {
+	i.locks.Lock(name)
+	defer i.locks.Unlock(name)
+
+	i.createImportant(data)
+
+	s.mu.Lock()
+	i.data[name] = data
+	s.mu.Unlock()
+}
+
+func (i *important) createImportant(data interface{}) {
+	time.Sleep(10 * time.Second)
+}
+```
+
+For functions dealing with a given name, always lock at the beginning of the
+function (or before doing anything with the underlying state), this ensures any
+other function that is dealing with the same name will block.
+
+When needing to modify the underlying data, use the global lock to ensure nothing
+else is modifying it at the same time.
+Since name lock is already in place, no reads will occur while the modification
+is being performed.
+