Benchmarks for engine/env

Docker-DCO-1.1-Signed-off-by: Alexandr Morozov <lk4d4math@gmail.com> (github: LK4D4)
Update libcontainer to 5210a236b92a8022a673108f347
Docker-DCO-1.1-Signed-off-by: Michael Crosby <michael@docker.com> (github: crosbymichael)
Update libcontainer references
Docker-DCO-1.1-Signed-off-by: Michael Crosby <michael@docker.com> (github: crosbymichael)
Rename libcontainer.Container to libcontainer.Config
Docker-DCO-1.1-Signed-off-by: Michael Crosby <michael@docker.com> (github: crosbymichael)
return 304 is status isn't modified in start and stop

Docker-DCO-1.1-Signed-off-by: Victor Vieux <vieux@docker.com> (github: vieux)
Merge pull request #6216 from gsalgado/convert-integration-tests

Convert integration/api_test:TestGetEvents into a unit test and a CLI test
Merge pull request #6648 from LK4D4/truncindex_bench

Truncindex benchmarks
Merge pull request #6595 from LK4D4/env_benchmarks

Benchmarks for engine/env
Merge pull request #6650 from crosbymichael/update-libcontainer-post-refactor

Update libcontainer dep to 5210a236b92a8022a673108f347
Fix search integration-cli test

Docker-DCO-1.1-Signed-off-by: Victor Vieux <vieux@docker.com> (github: vieux)
Merge pull request #6643 from kzys/freebsd-cp

cp's -T and --reflink=auto are only available on GNU coreutils
Merge pull request #6629 from SvenDowideit/move-man-pages-to-docs

move the man pages to the docs/ dir
Merge pull request #6654 from vieux/fix_test_search

Fix search integration-cli test
Remove viewport tag to fix iPhone scaling
Document the pause and unpause commands available on API v1.12 onwards

Docker-DCO-1.1-Signed-off-by: Abel Muiño <amuino@gmail.com> (github: amuino)
Add mutex warning when specifying -icc or -ip-forward and -iptables=false

Docker-DCO-1.1-Signed-off-by: Erik Hollensbe <github@hollensbe.org> (github: erikh)
Merge pull request #6651 from erikh/6002-conflicting-iptables-options

Add mutex warning when specifying -icc or -ip-forward and -iptables=false
Change floats to ints recursively on env encoding

Fixes #6246
Docker-DCO-1.1-Signed-off-by: Alexandr Morozov <lk4d4math@gmail.com> (github: LK4D4)
Merge pull request #6659 from vieux/pr_6248

Change floats to ints recursively on env encoding
Merge pull request #6658 from amuino/doc_pause_unpause

Document the pause and unpause commands available on API v1.12 onwards