add libpod/config

Refactor the `RuntimeConfig` along with related code from libpod into
libpod/config.  Note that this is a first step of consolidating code
into more coherent packages to make the code more maintainable and less
prone to regressions on the long runs.

Some libpod definitions were moved to `libpod/define` to resolve
circular dependencies.

Signed-off-by: Valentin Rothberg <rothberg@redhat.com>

libpod/oci_util.go

@@ -14,29 +14,9 @@ import (
 	"github.com/sirupsen/logrus"
 )
 
-const (
-	// CgroupfsCgroupsManager represents cgroupfs native cgroup manager
-	CgroupfsCgroupsManager = "cgroupfs"
-	// SystemdCgroupsManager represents systemd native cgroup manager
-	SystemdCgroupsManager = "systemd"
-
-	// ContainerCreateTimeout is the timeout before we decide we've failed
-	// to create a container.
-	// TODO: Make this generic - all OCI runtime operations should use the
-	// same timeout, this one.
-	// TODO: Consider dropping from 240 to 60 seconds. I don't think waiting
-	// 4 minutes versus 1 minute makes a real difference.
-	ContainerCreateTimeout = 240 * time.Second
-
-	// Timeout before declaring that runtime has failed to kill a given
-	// container
-	killContainerTimeout = 5 * time.Second
-	// DefaultShmSize is the default shm size
-	DefaultShmSize = 64 * 1024 * 1024
-	// NsRunDir is the default directory in which running network namespaces
-	// are stored
-	NsRunDir = "/var/run/netns"
-)
+// Timeout before declaring that runtime has failed to kill a given
+// container
+const killContainerTimeout = 5 * time.Second
 
 // ociError is used to parse the OCI runtime JSON log.  It is not part of the
 // OCI runtime specifications, it follows what runc does