Add --no-hostname option

Fixes: https://github.com/containers/podman/issues/25002

Also add the ability to inspect containers for
UseImageHosts and UseImageHostname.

Finally fixed some bugs in handling of --no-hosts for Pods,
which I descovered.

Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>

docs/source/markdown/options/no-hostname.md

@@ -1,9 +1,9 @@
 ####> This option file is used in:
-####>   podman build, farm build
+####>   podman build, create, farm build, kube play, pod create, run
 ####> If file is edited, make sure the changes
 ####> are applicable to all of those.
 #### **--no-hostname**
 
-Do not create the _/etc/hostname_ file in the container for RUN instructions.
+Do not create the _/etc/hostname_ file in the containers.
 
-By default, Buildah manages the _/etc/hostname_ file, adding the container's own hostname.  When the **--no-hostname** option is set, the image's _/etc/hostname_ will be preserved unmodified if it exists.
+By default, Podman manages the _/etc/hostname_ file, adding the container's own hostname.  When the **--no-hostname** option is set, the image's _/etc/hostname_ will be preserved unmodified if it exists.

docs/source/markdown/podman-container-inspect.1.md.in

@@ -62,6 +62,10 @@ Valid placeholders for the Go template are listed below:
 | .SizeRw                  | Size of upper (R/W) container layer, in bytes [1]  |
 | .State ...               | Container state info (struct)                      |
 | .StaticDir               | Path to container metadata dir (string)            |
+| .UseImageHostname        | Use /etc/hostname from the image if it exists? (string: true/false)
+|
+| .UseImageHosts           | Use /etc/hosts from the image? (string: true/false)
+|
 
 [1] This format specifier requires the **--size** option
 

docs/source/markdown/podman-create.1.md.in

@@ -268,6 +268,8 @@ If used together with **--pod**, the container does not join the pod's network n
 
 @@option no-healthcheck
 
+@@option no-hostname
+
 @@option no-hosts
 
 This option conflicts with **--add-host**.

docs/source/markdown/podman-kube-play.1.md.in

@@ -228,6 +228,8 @@ Note: When joining multiple networks use the **--network name:mac=\<mac\>** synt
 
 When no network option is specified and *host* network mode is not configured in the YAML file, a new network stack is created and pods are attached to it making possible pod to pod communication.
 
+@@option no-hostname
+
 @@option no-hosts
 
 This option conflicts with host added in the Kubernetes YAML.

docs/source/markdown/podman-pod-create.1.md.in

@@ -128,6 +128,8 @@ Invalid if using **--dns**, **--dns-option**, or **--dns-search** with **--netwo
 
 @@option network-alias
 
+@@option no-hostname
+
 @@option no-hosts
 
 This option conflicts with **--add-host**.

docs/source/markdown/podman-run.1.md.in

@@ -287,6 +287,8 @@ If used together with **--pod**, the container joins the pod's network namespace
 
 @@option no-healthcheck
 
+@@option no-hostname
+
 @@option no-hosts
 
 This option conflicts with **--add-host**.