Refactor common options in man pages

podman-create and -run have many options in common. To date,
these are copy-pasted and haphazardly maintained.

Solution: add an include mechanism, '@@option foo', such
that multiple md source files can fetch from one common file.

This is a Phase One commit, a very small subset of what's
possible. Purpose of this commit is ease of review. If this
passes review, much more (trickier stuff) will be forthcoming.

Signed-off-by: Ed Santiago <santiago@redhat.com>

docs/source/markdown/options/mount.md

@@ -0,0 +1,77 @@
+#### **--mount**=*type=TYPE,TYPE-SPECIFIC-OPTION[,...]*
+
+Attach a filesystem mount to the container
+
+Current supported mount TYPEs are **bind**, **volume**, **image**, **tmpfs** and **devpts**. <sup>[[1]](#Footnote1)</sup>
+
+       e.g.
+
+       type=bind,source=/path/on/host,destination=/path/in/container
+
+       type=bind,src=/path/on/host,dst=/path/in/container,relabel=shared
+
+       type=bind,src=/path/on/host,dst=/path/in/container,relabel=shared,U=true
+
+       type=volume,source=vol1,destination=/path/in/container,ro=true
+
+       type=tmpfs,tmpfs-size=512M,destination=/path/in/container
+
+       type=image,source=fedora,destination=/fedora-image,rw=true
+
+       type=devpts,destination=/dev/pts
+
+       Common Options:
+
+	      · src, source: mount source spec for bind and volume. Mandatory for bind.
+
+	      · dst, destination, target: mount destination spec.
+
+       Options specific to volume:
+
+	      · ro, readonly: true or false (default).
+
+	      . U, chown: true or false (default). Change recursively the owner and group of the source volume based on the UID and GID of the container.
+
+	      · idmap: true or false (default).  If specified, create an idmapped mount to the target user namespace in the container.
+
+       Options specific to image:
+
+	      · rw, readwrite: true or false (default).
+
+       Options specific to bind:
+
+	      · ro, readonly: true or false (default).
+
+	      · bind-propagation: shared, slave, private, unbindable, rshared, rslave, runbindable, or rprivate(default). See also mount(2).
+
+	      . bind-nonrecursive: do not set up a recursive bind mount. By default it is recursive.
+
+	      . relabel: shared, private.
+
+	      · idmap: true or false (default).  If specified, create an idmapped mount to the target user namespace in the container.
+
+	      . U, chown: true or false (default). Change recursively the owner and group of the source volume based on the UID and GID of the container.
+
+       Options specific to tmpfs:
+
+	      · ro, readonly: true or false (default).
+
+	      · tmpfs-size: Size of the tmpfs mount in bytes. Unlimited by default in Linux.
+
+	      · tmpfs-mode: File mode of the tmpfs in octal. (e.g. 700 or 0700.) Defaults to 1777 in Linux.
+
+	      · tmpcopyup: Enable copyup from the image directory at the same location to the tmpfs. Used by default.
+
+	      · notmpcopyup: Disable copying files from the image to the tmpfs.
+
+	      . U, chown: true or false (default). Change recursively the owner and group of the source volume based on the UID and GID of the container.
+
+       Options specific to devpts:
+
+	      · uid: UID of the file owner (default 0).
+
+	      · gid: GID of the file owner (default 0).
+
+	      · mode: permission mask for the file (default 600).
+
+	      · max: maximum number of PTYs (default 1048576).