generate: Drop runtime-supplied devices and mounts

Since opencontainers/runtime-spec#164 (part of the v0.1.1 release [1]), Linux
runtimes are required to supply these devices and mounts.  Specifying
them explicitly in the config should have no effect, and just makes
the config longer than it needs to be.

[1]: https://github.com/opencontainers/specs/blob/v0.1.1/config-linux.md#default-devices-and-file-systems

Signed-off-by: W. Trevor King <wking@tremily.us>

generate.go

@@ -619,32 +619,7 @@ func getDefaultTemplate() specs.LinuxSpec {
 				Cwd: "/",
 			},
 			Hostname: "shell",
-			Mounts: []specs.Mount{
-				{
-					Destination: "/proc",
-					Type:        "proc",
-					Source:      "proc",
-					Options:     nil,
-				},
-				{
-					Destination: "/dev/pts",
-					Type:        "devpts",
-					Source:      "devpts",
-					Options:     []string{"nosuid", "noexec", "newinstance", "ptmxmode=0666", "mode=0620", "gid=5"},
-				},
-				{
-					Destination: "/dev/shm",
-					Type:        "tmpfs",
-					Source:      "shm",
-					Options:     []string{"nosuid", "noexec", "nodev", "mode=1777", "size=65536k"},
-				},
-				{
-					Destination: "/sys",
-					Type:        "sysfs",
-					Source:      "sysfs",
-					Options:     []string{"nosuid", "noexec", "nodev"},
-				},
-			},
+			Mounts: []specs.Mount{},
 		},
 		Linux: specs.Linux{
 			Capabilities: []string{
@@ -687,44 +662,7 @@ func getDefaultTemplate() specs.LinuxSpec {
 					Soft: uint64(1024),
 				},
 			},
-			Devices: []specs.Device{
-				{
-					Type:  'c',
-					Path:  "/dev/null",
-					Major: 1,
-					Minor: 3,
-				},
-				{
-					Type:  'c',
-					Path:  "/dev/random",
-					Major: 1,
-					Minor: 8,
-				},
-				{
-					Type:  'c',
-					Path:  "/dev/full",
-					Major: 1,
-					Minor: 7,
-				},
-				{
-					Type:  'c',
-					Path:  "/dev/tty",
-					Major: 5,
-					Minor: 0,
-				},
-				{
-					Type:  'c',
-					Path:  "/dev/zero",
-					Major: 1,
-					Minor: 5,
-				},
-				{
-					Type:  'c',
-					Path:  "/dev/urandom",
-					Major: 1,
-					Minor: 9,
-				},
-			},
+			Devices: []specs.Device{},
 		},
 	}