Support podman image trust command

Display the trust policy of the host system. The trust policy is stored in the /etc/containers/policy.json file and defines a scope of registries or repositories.

Signed-off-by: Qi Wang <qiwan@redhat.com>

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+% podman-image-trust "1"
+
+# NAME
+podman\-trust - Manage container image trust policy
+
+
+# SYNOPSIS
+**podman image trust set|show**
+[**-h**|**--help**]
+[**-j**|**--json**]
+[**--raw**]
+[**-f**|**--pubkeysfile** KEY1 [**f**|**--pubkeysfile** KEY2,...]]
+[**-t**|**--type** signedBy|accept|reject]
+REGISTRY[/REPOSITORY]
+
+# DESCRIPTION
+Manages the trust policy of the host system. Trust policy describes
+a registry scope (registry and/or repository) that must be signed by public keys. Trust
+is defined in **/etc/containers/policy.json**. Trust is enforced when a user attempts to pull
+an image from a registry.
+
+Trust scope is evaluated by most specific to least specific. In other words, policy may
+be defined for an entire registry, but refined for a particular repository in that
+registry. See below for examples.
+
+Trust **type** provides a way to whitelist ("accept") or blacklist
+("reject") registries.
+
+Trust may be updated using the command **podman image trust set** for an existing trust scope.
+
+# OPTIONS
+**-h** **--help**
+  Print usage statement.
+
+**-f** **--pubkeysfile**
+  A path to an exported public key on the local system. Key paths
+  will be referenced in policy.json. Any path may be used but path
+  **/etc/pki/containers** is recommended. Option may be used multiple times to
+  require an image be sigend by multiple keys. One of **--pubkeys** or
+  **--pubkeysfile** is required for **signedBy** type.
+
+**-t** **--type**
+  The trust type for this policy entry. Accepted values:
+    **signedBy** (default): Require signatures with corresponding list of
+                        public keys
+    **accept**: do not require any signatures for this
+            registry scope
+    **reject**: do not accept images for this registry scope
+
+# show OPTIONS
+
+**--raw**
+  Output trust policy file as raw JSON
+
+**-j** **--json**
+  Output trust as JSON for machine parsing
+
+# EXAMPLES
+
+Accept all unsigned images from a registry
+
+    podman image trust set --type accept docker.io
+
+Modify default trust policy
+
+    podman image trust set -t reject default
+
+Display system trust policy
+
+    podman image trust show
+
+Display trust policy file
+
+    podman image trust show --raw
+
+Display trust as JSON
+
+    podman image trust show --json
+
+# HISTORY
+December 2018, originally compiled by Qi Wang (qiwan at redhat dot com)