criu(8): remove obsoleted options

Remove the following options (obsoleted by --external):

	--ext-unix-sk
	--veth-pair
	--ext-mount-map
	--enable-external-masters
	--enable-exteral-sharing

travis-ci: success for Add/fix description of --external and --inherit-fd
Signed-off-by: Kir Kolyshkin <kir@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

Documentation/criu.txt

@@ -147,10 +147,6 @@ In other words, do not use it unless really needed.
 *-s*, *--leave-stopped*::
     Leave tasks in stopped state after checkpoint, instead of killing.
 
-*-x*, *--ext-unix-sk* ['inode'[,'inode'...]]::
-    Dump external unix sockets. Optionally passing a comma-separated
-    list of inodes to allow a one sided dump for those.
-
 *--freeze-cgroup*::
    Use cgroup freezer to collect processes.
 
@@ -214,9 +210,6 @@ For example, the command line for the above example should look like this:
     The TCP stack on the client side is expected to handle the
     re-connect gracefully.
 
-*--veth-pair* 'IN'*=*'OUT'::
-    Relation between outside and inside names of veth devices.
-
 *--evasive-devices*::
     Use any path to a device file if the original one is inaccessible.
 
@@ -235,11 +228,6 @@ For example, the command line for the above example should look like this:
     are taken into dump, so it is only safe to use this for enclosed containers
     where locks are not held by any processes outside of dumped process tree.
 
-*-M*, *--ext-mount-map* 'KEY'*:*'VAL'::
-    Setup mapping for external mounts. Here 'KEY' is a mountpoint inside
-    a container, and corresponding 'VAL' is a string to be written into
-    the image as the mountpoint\'s root value.
-
 *--link-remap*::
     Allows to link unlinked files back, if possible (modifies filesystem
     during *restore*).
@@ -331,21 +319,6 @@ The 'mode' may be one of the following:
 *-l*, *--file-locks*::
     Restore file locks from the image.
 
-*-M*, *--ext-mount-map* 'KEY'*:*'VAL'::
-    Setup mapping for external mounts. 'KEY' is the value from the image
-    ('VAL' from dump) and the 'VAL' is the path on host that will be
-    bind-mounted into container (to the mountpoint path from image).
-
-*--ext-mount-map* *auto*::
-    This is a special case. If this flag is passed, when an external
-    mount is missing from the command line '*--ext-mount-map* KEY:VAL' syntax,
-    criu attempts to automatically resolve this mount from its namespace.
-
-*--enable-external-sharing*::
-*--enable-external-masters*::
-    These flags enable external shared or slave mounts to be resolved
-    automatically when '*--ext-mount-map auto*' is passed.
-
 *--auto-dedup*::
     As soon as a page is restored it get punched out from image.