Merge pull request #1642 from kunalkushwaha/image-tree

Tree implementation for podman images

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+% podman-image-tree(1)
+
+## NAME
+podman\-image\-tree - Prints layer hierarchy of an image in a tree format
+
+## SYNOPSIS
+**podman image tree** [*image*:*tag*]**|**[*image-id*]
+[**--help**|**-h**]
+
+## DESCRIPTION
+Prints layer hierarchy of an image in a tree format.
+If you do not provide a *tag*, podman will default to `latest` for the *image*.
+Layers are indicated with image tags as `Top Layer of`, when the tag is known locally.
+## OPTIONS
+
+**--help**, **-h**
+
+Print usage statement
+
+**--whatrequires**
+
+Show all child images and layers of the specified image
+
+## EXAMPLES
+
+```
+$ podman pull docker.io/library/wordpress
+$ podman pull docker.io/library/php:7.2-apache
+
+$ podman image tree docker.io/library/wordpress
+Image ID: 6e880d17852f
+Tags:    [docker.io/library/wordpress:latest]
+Size:    429.9MB
+Image Layers
+├──  ID: 3c816b4ead84 Size: 58.47MB
+├──  ID: e39dad2af72e Size: 3.584kB
+├──  ID: b2d6a702383c Size: 213.6MB
+├──  ID: 94609408badd Size: 3.584kB
+├──  ID: f4dddbf86725 Size: 43.04MB
+├──  ID: 8f695df43a4c Size: 11.78kB
+├──  ID: c29d67bf8461 Size: 9.728kB
+├──  ID: 23f4315918f8 Size:  7.68kB
+├──  ID: d082f93a18b3 Size: 13.51MB
+├──  ID: 7ea8bedcac69 Size: 4.096kB
+├──  ID: dc3bbf7b3dc0 Size: 57.53MB
+├──  ID: fdbbc6404531 Size: 11.78kB
+├──  ID: 8d24785437c6 Size: 4.608kB
+├──  ID: 80715f9e8880 Size: 4.608kB Top Layer of: [docker.io/library/php:7.2-apache]
+├──  ID: c93cbcd6437e Size: 3.573MB
+├──  ID: dece674f3cd1 Size: 4.608kB
+├──  ID: 834f4497afda Size: 7.168kB
+├──  ID: bfe2ce1263f8 Size: 40.06MB
+└──  ID: 748e99b214cf Size: 11.78kB Top Layer of: [docker.io/library/wordpress:latest]
+
+$ podman pull docker.io/circleci/ruby:latest
+$ podman pull docker.io/library/ruby:latest
+
+$ podman image tree ae96a4ad4f3f --whatrequires
+Image ID: ae96a4ad4f3f
+Tags:    [docker.io/library/ruby:latest]
+Size:    894.2MB
+Image Layers
+└──  ID: 9c92106221c7 Size:  2.56kB Top Layer of: [docker.io/library/ruby:latest]
+ ├──  ID: 1b90f2b80ba0 Size: 3.584kB
+ │   ├──  ID: 42b7d43ae61c Size: 169.5MB
+ │   ├──  ID: 26dc8ba99ec3 Size: 2.048kB
+ │   ├──  ID: b4f822db8d95 Size: 3.957MB
+ │   ├──  ID: 044e9616ef8a Size: 164.7MB
+ │   ├──  ID: bf94b940200d Size: 11.75MB
+ │   ├──  ID: 4938e71bfb3b Size: 8.532MB
+ │   └──  ID: f513034bf553 Size: 1.141MB
+ ├──  ID: 1e55901c3ea9 Size: 3.584kB
+ ├──  ID: b62835a63f51 Size: 169.5MB
+ ├──  ID: 9f4e8857f3fd Size: 2.048kB
+ ├──  ID: c3b392020e8f Size: 3.957MB
+ ├──  ID: 880163026a0a Size: 164.8MB
+ ├──  ID: 8c78b2b14643 Size: 11.75MB
+ ├──  ID: 830370cfa182 Size: 8.532MB
+ └──  ID: 567fd7b7bd38 Size: 1.141MB Top Layer of: [docker.io/circleci/ruby:latest]
+
+```
+
+
+## SEE ALSO
+podman(1), crio(8)
+
+## HISTORY
+Feb 2019, Originally compiled by Kunal Kushwaha <kushwaha_kunal_v7@lab.ntt.co.jp>