Refactor process.go for platform specific

Signed-off-by: John Howard <jhoward@microsoft.com>

Move process sorter to new file

Signed-off-by: Michael Crosby <crosbymichael@gmail.com>

Sort containers by id

This will not be the most accurate sorting but atleast the list will be
consistent inbetween calls.

Signed-off-by: Michael Crosby <crosbymichael@gmail.com>

Allow runtime to be configurable via daemon start

This allows people to pass an alternate name or location to the runtime
binary to start containers.

Signed-off-by: Michael Crosby <crosbymichael@gmail.com>

Fix state output for containers

Return the proper state/status for a container by checking if the pid is
still alive.  Also fix the cleanup handling in the shim to make sure
containers are not left behind.

Signed-off-by: Michael Crosby <crosbymichael@gmail.com>

Properly wait for container start

Signed-off-by: Michael Crosby <crosbymichael@gmail.com>

supervisor/sort.go

@@ -0,0 +1,27 @@
+package supervisor
+
+import (
+	"sort"
+
+	"github.com/docker/containerd/runtime"
+)
+
+func sortProcesses(p []runtime.Process) {
+	sort.Sort(&processSorter{p})
+}
+
+type processSorter struct {
+	processes []runtime.Process
+}
+
+func (s *processSorter) Len() int {
+	return len(s.processes)
+}
+
+func (s *processSorter) Swap(i, j int) {
+	s.processes[i], s.processes[j] = s.processes[j], s.processes[i]
+}
+
+func (s *processSorter) Less(i, j int) bool {
+	return s.processes[j].ID() == "init"
+}