Fix cap drop issues with lxc

This uses "," instead of spaces so that the flags are parsed correctly
and also does not do a strings.Split on an empty string because
strings.Split will return a slice with one element, and empty string
causing parsing to fail when it validates that the cap exists.
Docker-DCO-1.1-Signed-off-by: Michael Crosby <michael@docker.com> (github: crosbymichael)
Use : to split caps in sysinit flags
Docker-DCO-1.1-Signed-off-by: Michael Crosby <michael@docker.com> (github: crosbymichael)
Updating to reflect changes in the SoftLayer portal and product naming conventions.

Docker-DCO-1.1-Signed-off-by: Phil Jackson <underscorephil@gmail.com> (github: underscorephil)
Adding the query parameters to insert api call for all <= 1.10 and
removing the insert documentation for > 1.10 since it has been removed
in 1.11. This commit fixes #7183
Docker-DCO-1.1-Signed-off-by: Julien Bordellier <me@julienbordellier.com> (github: jstoja)
Update HTTP Proxy Section

Docker.service file location was missing the /usr dir.
Correct Typo In Documentation
Merge pull request #7062 from crosbymichael/fix-lxc-caps

Fix cap drop issues with lxc
Merge pull request #7280 from knappe/patch-1

Correct Typo In Documentation
Merge pull request #7269 from r0n22/patch-1

Update HTTP Proxy Section
Merge pull request #7256 from jstoja/docs-api-insert-image

Fixing docs - Insert api call
Merge pull request #6877 from underscorephil/patch-1

Update softlayer.md
server/buildfile.go -> builder/builder.go; add maintainers file

Docker-DCO-1.1-Signed-off-by: Erik Hollensbe <github@hollensbe.org> (github: erikh)