Add volume path to default libpod.conf (and manpage)

Signed-off-by: Matthew Heon <matthew.heon@pm.me>

docs/libpod.conf.5.md

@@ -13,7 +13,7 @@ libpod to manage containers.
   Default transport method for pulling and pushing images
 
 **runtime**=""
-  Default OCI runtime to use if nothing is specified
+  Default OCI runtime to use if nothing is specified in **runtimes**
 
 **runtimes**
   For each OCI runtime, specify a list of paths to look for.  The first one found is used.
@@ -87,6 +87,10 @@ libpod to manage containers.
   The default number available is 2048.
   If this is changed, a lock renumbering must be performed, using the `podman system renumber` command.
 
+**volume_path**=""
+  Directory where named volumes will be created in using the default volume driver.
+  By default this will be configured relative to where containers/storage stores containers.
+
 ## FILES
   `/usr/share/containers/libpod.conf`, default libpod configuration path
 

libpod.conf

@@ -93,6 +93,12 @@ pause_command = "/pause"
 # 'podman system renumber' command).
 num_locks = 2048
 
+# Directory for libpod named volumes.
+# By default, this will be configured relative to where containers/storage
+# stores containers.
+# Uncomment to change location from this default.
+#volume_path = "/var/lib/containers/storage/volumes"
+
 # Default OCI runtime
 runtime = "runc"