Rename --bundle to --file

This renames the '--bundle' flag for docker (stack) deploy
to be consistent with 'docker build'.

Note that there's no shorthand '-f' added for now,
because this may be confusing on 'docker stack config',
which also takes a file, and for which we may want to
have a '--format' flag in future.

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
Upstream-commit: b2d71bfbe1
Component: cli

components/cli/docs/reference/commandline/stack_deploy.md

@@ -20,7 +20,7 @@ Aliases:
   deploy, up
 
 Options:
-      --bundle string   Path to a Distributed Application Bundle file (Default: STACK.dab)
+      --file   string   Path to a Distributed Application Bundle file (Default: STACK.dab)
       --help            Print usage
 ```