[17.10] backport doc fixes and shell completion script fixes

[andrewhsu]

All cherry-picks went in clean, no conflicts.

docker/cli#610 Update bash completion and deprecation for synchronous service updates

$ git cherry-pick -s -x -Xsubtree=components/cli 60bfaba 20d9cec
[d f26232e8f6] Update bash completion for synchronous `docker service` commands
 Author: Harald Albers <github@albersweb.de>
 Date: Sat Oct 7 13:57:26 2017 +0200
 1 file changed, 3 insertions(+), 3 deletions(-)
[d 6fc2c6b8c5] Update deprecation for synchronous service updates
 Author: Harald Albers <github@albersweb.de>
 Date: Sat Oct 7 14:28:56 2017 +0200
 1 file changed, 5 insertions(+), 2 deletions(-)

docker/cli#611 Add bash completion for stack deploy --resolve-image

$ git cherry-pick -s -x -Xsubtree=components/cli 9559b9b
[d b0596beda5] Add bash completion for `stack deploy --resolve-image`
 Author: Harald Albers <github@albersweb.de>
 Date: Mon Oct 9 13:29:17 2017 +0200
 2 files changed, 8 insertions(+), 2 deletions(-)

docker/cli#618 Add bash completion for secret create --driver

$ git cherry-pick -s -x -Xsubtree=components/cli 1d7a31f
[d 550052ebae] Add bash completion for `secret create --driver`
 Author: Harald Albers <github@albersweb.de>
 Date: Wed Oct 11 18:55:28 2017 +0200
 1 file changed, 3 insertions(+), 3 deletions(-)

docker/cli#580 Update rmi.md

$ git cherry-pick -s -x -Xsubtree=components/cli 9004495
[d 8b13940b3b] Update rmi.md
 Author: djgoosen <djgoosen@users.noreply.github.com>
 Date: Sun Oct 1 21:36:13 2017 -0700
 1 file changed, 1 insertion(+), 1 deletion(-)

docker/cli#598 Fix dockerd reference heading levels

$ git cherry-pick -s -x -Xsubtree=components/cli aca0421
[d 792e8f9a82] Fix dockerd reference heading levels
 Author: Sebastiaan van Stijn <github@gone.nl>
 Date: Wed Oct 4 18:09:12 2017 +0200
 1 file changed, 10 insertions(+), 10 deletions(-)

docker/cli#603 Fix markdown link in service-create reference docs

$ git cherry-pick -s -x -Xsubtree=components/cli 6b6511f
[d e7f51b183f] Fix markdown link in service-create reference docs
 Author: Sebastiaan van Stijn <github@gone.nl>
 Date: Thu Oct 5 12:17:40 2017 +0200
 1 file changed, 3 insertions(+), 2 deletions(-)

[andrewhsu]

cc @albers

[thaJeztah]

LGTM, thank you!