adding message option to the import subcommand

Signed-off-by: Taylor Jones <monitorjbl@gmail.com>

docs/reference/commandline/import.md

@@ -18,6 +18,7 @@ weight=1
 	optionally tag it.
 
       -c, --change=[]     Apply specified Dockerfile instructions while importing the image
+      -m, --message=      Set commit message for imported image
 
 You can specify a `URL` or `-` (dash) to take data directly from `STDIN`. The
 `URL` can point to an archive (.tar, .tar.gz, .tgz, .bzip, .tar.xz, or .txz)
@@ -46,6 +47,10 @@ Import to docker via pipe and `STDIN`.
 
     $ cat exampleimage.tgz | docker import - exampleimagelocal:new
 
+Import with a commit message 
+
+    $ cat exampleimage.tgz | docker import --message "New image imported from tarball" - exampleimagelocal:new
+
 Import to docker from a local archive.
 
     $ docker import /path/to/exampleimage.tgz

man/docker-import.1.md

@@ -7,6 +7,7 @@ docker-import - Create an empty filesystem image and import the contents of the
 # SYNOPSIS
 **docker import**
 [**-c**|**--change**[= []**]]
+[**-m**|**--message**[=*MESSAGE*]]
 [**--help**]
 file|URL|- [REPOSITORY[:TAG]]
 
@@ -15,6 +16,9 @@ file|URL|- [REPOSITORY[:TAG]]
    Apply specified Dockerfile instructions while importing the image
    Supported Dockerfile instructions: `CMD`|`ENTRYPOINT`|`ENV`|`EXPOSE`|`ONBUILD`|`USER`|`VOLUME`|`WORKDIR`
 
+**-m**, **--message**=""
+   Set commit message for imported image
+
 # DESCRIPTION
 Create a new filesystem image from the contents of a tarball (`.tar`,
 `.tar.gz`, `.tgz`, `.bzip`, `.tar.xz`, `.txz`) into it, then optionally tag it.
@@ -35,6 +39,10 @@ Import to docker via pipe and stdin:
 
     # cat exampleimage.tgz | docker import - example/imagelocal
 
+Import with a commit message 
+
+    # cat exampleimage.tgz | docker import --message "New image imported from tarball" - exampleimagelocal:new
+
 Import to a Docker image from a local file.
 
     # docker import /path/to/exampleimage.tgz