Standardize "curl" arguments across the repo to be or include "-sSL"

- https://botbot.me/freenode/docker-dev/msg/17315692/
- https://botbot.me/freenode/docker-dev/msg/17315994/

Docker-DCO-1.1-Signed-off-by: Andrew Page <admwiggin@gmail.com> (github: tianon)
add FSETID back to the caps whitelist

Docker-DCO-1.1-Signed-off-by: Victor Vieux <vieux@docker.com> (github: vieux)
Basic --cap-add and --cap-drop support for native

Docker-DCO-1.1-Signed-off-by: Victor Vieux <vieux@docker.com> (github: vieux)
Basic --cap-add and --cap-drop support for lxc

Docker-DCO-1.1-Signed-off-by: Victor Vieux <vieux@docker.com> (github: vieux)
fix job and add tests

Docker-DCO-1.1-Signed-off-by: Victor Vieux <vieux@docker.com> (github: vieux)
small refactoring

Docker-DCO-1.1-Signed-off-by: Victor Vieux <vieux@docker.com> (github: vieux)
add basic support for 'all'

Docker-DCO-1.1-Signed-off-by: Victor Vieux <vieux@docker.com> (github: vieux)
support add and drop in both order

Docker-DCO-1.1-Signed-off-by: Victor Vieux <vieux@docker.com> (github: vieux)
add check for invalid caps

Docker-DCO-1.1-Signed-off-by: Victor Vieux <vieux@docker.com> (github: vieux)
add doc

Docker-DCO-1.1-Signed-off-by: Victor Vieux <vieux@docker.com> (github: vieux)
update api doc

Docker-DCO-1.1-Signed-off-by: Victor Vieux <vieux@docker.com> (github: vieux)
Fix MarkDown in Docker Registry API docs

Docker-DCO-1.1-Signed-off-by: Gabor Nagy <mail@aigeruth.hu> (github: Aigeruth)
Some resource clean ups in archive

Docker-DCO-1.1-Signed-off-by: Alexandr Morozov <lk4d4math@gmail.com> (github: LK4D4)
api/server/MAINTAINERS: comment proppy (vacation)

Docker-DCO-1.1-Signed-off-by: Johan Euphrosine <proppy@google.com> (github: proppy)
Merge pull request #7014 from proppy/patch-6

api/server/MAINTAINERS: comment proppy (vacation)
Merge pull request #7016 from LK4D4/fix_some_cleanups_in_archive

Some resource clean ups in archive
Merge pull request #6970 from vieux/add_FSETID

add FSETID back to the caps whitelist
Merge pull request #6968 from vieux/cap_add_drop

Add support for --cap-add and --cap-drop
Add a conditional to contrib/init/sysvinit-debian/docker for Dash vs Bash support

Docker-DCO-1.1-Signed-off-by: Andrew Page <admwiggin@gmail.com> (github: tianon)
Update libcontainer dep to fb67bb80b4205bece36ff70
Docker-DCO-1.1-Signed-off-by: Michael Crosby <michael@docker.com> (github: crosbymichael)