registry: remove unneeded time.Duration()

These constants don't need to use time.Duration(). Fixup this file since
it seems to be the only one using this style.

Docker-DCO-1.1-Signed-off-by: Brandon Philips <brandon.philips@coreos.com> (github: philips)
Fixed up if statement

Signed-off-by: Levi Gross <levi@levigross.com>

Docker-DCO-1.1-Signed-off-by: Levi Gross <levi@levigross.com> (github: levigross)
Remove and vendor libcontainer
Docker-DCO-1.1-Signed-off-by: Michael Crosby <michael@crosbymichael.com> (github: crosbymichael)
Update libcontainer imports
Docker-DCO-1.1-Signed-off-by: Michael Crosby <michael@crosbymichael.com> (github: crosbymichael)
Use libcontainer version tag for vendor script
Docker-DCO-1.1-Signed-off-by: Michael Crosby <michael@crosbymichael.com> (github: crosbymichael)
Fix some bullet points so they render correctly.
minor spelling fix
Merge pull request #6349 from chrismckinnel/master

Fix some bullet points so they render correctly.
Merge pull request #6351 from lenw/patch-1

minor spelling fix
Merge pull request #6277 from philips/remove-unneeded-time-duration

registry: remove unneeded time.Duration()
Merge pull request #6357 from crosbymichael/vendor-libcontainer

Vendor libcontainer
Merge pull request #6335 from levigross/master

Fixed up if statement
Fix go vet errors

Docker-DCO-1.1-Signed-off-by: Alexandr Morozov <lk4d4math@gmail.com> (github: LK4D4)