Rename oci-image-tool create to oci-image-tool create-bundle

`oci-image-tool create` is confusing, rename it to `create-bundle`,
and we may have `create-layer` in future which infligh in
opencontainers#8, and we may have
`create-image` in future.

Signed-off-by: Lei Jitang <leijitang@huawei.com>

Makefile

@@ -35,7 +35,7 @@ all: tool man
 .PHONY: man
 man:
 	go-md2man -in "man/oci-image-tool.1.md" -out "oci-image-tool.1"
-	go-md2man -in "man/oci-image-tool-create.1.md" -out "oci-image-tool-create.1"
+	go-md2man -in "man/oci-image-tool-create-bundle.1.md" -out "oci-image-tool-create-bundle.1"
 	go-md2man -in "man/oci-image-tool-unpack.1.md" -out "oci-image-tool-unpack.1"
 	go-md2man -in "man/oci-image-tool-validate.1.md" -out "oci-image-tool-validate.1"
 

cmd/oci-image-tool/create.go → cmd/oci-image-tool/bundle.go

@@ -76,7 +76,7 @@ func createHandle(context *cli.Context) error {
 }
 
 var createCommand = cli.Command{
-	Name:   "create",
+	Name:   "create-bundle",
 	Usage:  "Create an OCI image runtime bundle",
 	Action: createHandle,
 	Flags: []cli.Flag{

man/oci-image-tool-create.1.md → man/oci-image-tool-create-bundle.1.md

@@ -2,13 +2,13 @@
 % OCI Community
 % JULY 2016
 # NAME
-oci-image-tool create \- Create an OCI runtime bundle
+oci-image-tool create-bundle \- Create an OCI runtime bundle
 
 # SYNOPSIS
-**oci-image-tool create** [src] [dest] [OPTIONS]
+**oci-image-tool create-bundle** [src] [dest] [OPTIONS]
 
 # DESCRIPTION
-`oci-image-tool create` validates an application/vnd.oci.image.manifest.v1+json and unpacks its layered filesystem to `dest/rootfs`, although the target directory is configurable with `--rootfs`. See **oci-image-tool unpack**(1) for more details on this process.
+`oci-image-tool createi-bundle` validates an application/vnd.oci.image.manifest.v1+json and unpacks its layered filesystem to `dest/rootfs`, although the target directory is configurable with `--rootfs`. See **oci-image-tool unpack**(1) for more details on this process.
 
 Also translates the referenced config from application/vnd.oci.image.config.v1+json to a
 runtime-spec-compatible `dest/config.json`.
@@ -35,7 +35,7 @@ runtime-spec-compatible `dest/config.json`.
 ```
 $ skopeo copy docker://busybox oci:busybox-oci
 $ mkdir busybox-bundle
-$ oci-image-tool create --ref latest busybox-oci busybox-bundle
+$ oci-image-tool create-bundle --ref latest busybox-oci busybox-bundle
 $ cd busybox-bundle && sudo runc run busybox
 [...]
 ```