Vendor containers/storage, update containers/image

Vendor containers/storage, and its dependencies github.com/pborman/uuid
and github.com/mistifyio/go-zfs, which we didn't already use.

Update the build Dockerfile to install their dependencies.

Add scriptlets that try to detect whether or not we need to use the
"libdm_no_deferred_remove" and/or "btrfs_noversion" build tags.

Signed-off-by: Nalin Dahyabhai <nalin@redhat.com>

vendor/github.com/containers/storage/drivers/counter.go

@@ -0,0 +1,67 @@
+package graphdriver
+
+import "sync"
+
+type minfo struct {
+	check bool
+	count int
+}
+
+// RefCounter is a generic counter for use by graphdriver Get/Put calls
+type RefCounter struct {
+	counts  map[string]*minfo
+	mu      sync.Mutex
+	checker Checker
+}
+
+// NewRefCounter returns a new RefCounter
+func NewRefCounter(c Checker) *RefCounter {
+	return &RefCounter{
+		checker: c,
+		counts:  make(map[string]*minfo),
+	}
+}
+
+// Increment increaes the ref count for the given id and returns the current count
+func (c *RefCounter) Increment(path string) int {
+	c.mu.Lock()
+	m := c.counts[path]
+	if m == nil {
+		m = &minfo{}
+		c.counts[path] = m
+	}
+	// if we are checking this path for the first time check to make sure
+	// if it was already mounted on the system and make sure we have a correct ref
+	// count if it is mounted as it is in use.
+	if !m.check {
+		m.check = true
+		if c.checker.IsMounted(path) {
+			m.count++
+		}
+	}
+	m.count++
+	c.mu.Unlock()
+	return m.count
+}
+
+// Decrement decreases the ref count for the given id and returns the current count
+func (c *RefCounter) Decrement(path string) int {
+	c.mu.Lock()
+	m := c.counts[path]
+	if m == nil {
+		m = &minfo{}
+		c.counts[path] = m
+	}
+	// if we are checking this path for the first time check to make sure
+	// if it was already mounted on the system and make sure we have a correct ref
+	// count if it is mounted as it is in use.
+	if !m.check {
+		m.check = true
+		if c.checker.IsMounted(path) {
+			m.count++
+		}
+	}
+	m.count--
+	c.mu.Unlock()
+	return m.count
+}