Document containers.conf settings for remote connections

Currently we don't document which end of the podman-remote client server
operations uses the containers.conf.  This PR begins documenting this
and then testing to make sure the defaults follow the rules.

Fixes: https://github.com/containers/podman/issues/7657

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

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

@@ -18,6 +18,10 @@ any point.
 
 The initial status of the container created with **podman create** is 'created'.
 
+Default settings for flags are defined in `containers.conf`. Most settings for
+remote connections use the server's containers.conf, except when documented in
+man pages.
+
 ## OPTIONS
 #### **--add-host**=*host*
 
@@ -817,6 +821,7 @@ Signal to stop a container. Default is SIGTERM.
 #### **--stop-timeout**=*seconds*
 
 Timeout (in seconds) to stop a container. Default is 10.
+Remote connections use local containers.conf for defaults
 
 #### **--subgidname**=*name*
 
@@ -893,10 +898,12 @@ standard input.
 #### **--tz**=*timezone*
 
 Set timezone in container. This flag takes area-based timezones, GMT time, as well as `local`, which sets the timezone in the container to match the host machine. See `/usr/share/zoneinfo/` for valid timezones.
+Remote connections use local containers.conf for defaults
 
 #### **--umask**=*umask*
 
 Set the umask inside the container. Defaults to `0022`.
+Remote connections use local containers.conf for defaults
 
 #### **--uidmap**=*container_uid:host_uid:amount*
 

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

@@ -33,6 +33,10 @@ is located at _/run/.containerenv_.
 When running from a user defined network namespace, the _/etc/netns/NSNAME/resolv.conf_
 will be used if it exists, otherwise _/etc/resolv.conf_ will be used.
 
+Default settings are defined in `containers.conf`. Most settings for remote
+connections use the servers containers.conf, except when documented in man
+pages.
+
 ## OPTIONS
 #### **--add-host**=_host_:_ip_
 
@@ -857,6 +861,7 @@ Signal to stop a container. Default is **SIGTERM**.
 #### **--stop-timeout**=*seconds*
 
 Timeout to stop a container. Default is **10**.
+Remote connections use local containers.conf for defaults
 
 #### **--subgidname**=*name*
 
@@ -952,10 +957,12 @@ standard input.
 #### **--tz**=*timezone*
 
 Set timezone in container. This flag takes area-based timezones, GMT time, as well as `local`, which sets the timezone in the container to match the host machine. See `/usr/share/zoneinfo/` for valid timezones.
+Remote connections use local containers.conf for defaults
 
 #### **--umask**=*umask*
 
 Set the umask inside the container. Defaults to `0022`.
+Remote connections use local containers.conf for defaults
 
 #### **--uidmap**=*container_uid*:*host_uid*:*amount*
 

docs/source/markdown/podman.1.md

@@ -17,6 +17,10 @@ Podman uses Buildah(1) internally to create container images. Both tools share i
 (not container) storage, hence each can use or manipulate images (but not containers)
 created by the other.
 
+Default settings for flags are defined in `containers.conf`. Most settings for
+Remote connections use the server's containers.conf, except when documented in
+man pages.
+
 **podman [GLOBAL OPTIONS]**
 
 ## GLOBAL OPTIONS
@@ -33,6 +37,7 @@ Path of the configuration directory for CNI networks.  (Default: `/etc/cni/net.d
 
 #### **--connection**, **-c**
 Connection to use for remote podman (Default connection is configured in `containers.conf`)
+Remote connections use local containers.conf for default.
 
 #### **--conmon**
 Path of the conmon binary (Default path is configured in `containers.conf`)
@@ -71,6 +76,7 @@ Identity value resolution precedence:
  - command line value
  - environment variable `CONTAINER_SSHKEY`, if `CONTAINER_HOST` is found
  - `containers.conf`
+Remote connections use local containers.conf for default.
 
 #### **--log-level**=*level*
 
@@ -86,6 +92,7 @@ Path to the command binary to use for setting up a network.  It is currently onl
 
 #### **--remote**, **-r**
 Access Podman service will be remote
+Remote connections use local containers.conf for default.
 
 #### **--url**=*value*
 URL to access Podman service (default from `containers.conf`, rootless `unix://run/user/$UID/podman/podman.sock` or as root `unix://run/podman/podman.sock`).
@@ -104,6 +111,7 @@ URL value resolution precedence:
  - environment variable `CONTAINER_HOST`
  - `containers.conf`
  - `unix://run/podman/podman.sock`
+Remote connections use local containers.conf for default.
 
 #### **--root**=*value*