chore(graph/graph): remove dead code

This code was introduced with commented out sections. Just delete them.

Original commit: 18fc707fdf06aeb50fa5250f59f0ef4597d7cf73

Docker-DCO-1.1-Signed-off-by: Brandon Philips <brandon.philips@coreos.com> (github: philips)
Fix race condition during socket creation

Docker-DCO-1.1-Signed-off-by: Gleb Fotengauer-Malinovskiy <glebfm@altlinux.org> (github: glebfm)
update container's state after we close the waitLock

Docker-DCO-1.1-Signed-off-by: Victor Vieux <vieux@docker.com> (github: vieux)
Use Timeout Conn wrapper to set read deadline for downloading layer

Docker-DCO-1.1-Signed-off-by: Derek <crq@kernel.org> (github: crquan)
Added a new method cgroups.GetStats() which will return a cgroups.Stats object which will contain all the available cgroup Stats.
Remove old Stats interface in libcontainers cgroups package.
Changed Stats to use unit64 instead of int64 to prevent integer overflow issues.
Updated unit tests.

Docker-DCO-1.1-Signed-off-by: Vishnu Kannan <vishnuk@google.com> (github: vishh)
Merge pull request #6096 from vishh/stats_strongtype

Replaced fs.Stats() interface with fs.GetStats() which returns a cgroups.Stats strong type
Merge pull request #6048 from crquan/use-timeout-conn

Use Timeout Conn wrapper to set read deadline for downloading layer
block aufs on incompatible file systems

Docker-DCO-1.1-Signed-off-by: Cristian Staretu <cristian.staretu@gmail.com> (github: unclejack)
Merge pull request #6109 from unclejack/block_aufs_on_top_of_btrfs

block aufs on incompatible file systems
Merge pull request #5855 from philips/remove-dead-code

chore(graph/graph): remove dead code
Fix races on TagStore accessing

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

Docker-DCO-1.1-Signed-off-by: Alexandr Morozov <lk4d4math@gmail.com> (github: LK4D4)
Fix races in set/get currentInterfaces in networkdriver

Docker-DCO-1.1-Signed-off-by: Alexandr Morozov <lk4d4math@gmail.com> (github: LK4D4)
Fix race in native driver on activeContainers usage

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

Docker-DCO-1.1-Signed-off-by: Alexandr Morozov <lk4d4math@gmail.com> (github: LK4D4)
Atomically increment sequence in pkg/netlink

Docker-DCO-1.1-Signed-off-by: Alexandr Morozov <lk4d4math@gmail.com> (github: LK4D4)
Merge pull request #6118 from LK4D4/fix_race_conditions

Fix race conditions
optimize restore & use Getenv less in daemon.go

Docker-DCO-1.1-Signed-off-by: Cristian Staretu <cristian.staretu@gmail.com> (github: unclejack)
Merge pull request #6121 from unclejack/refactor_daemon_restore

optimize restore & use Getenv less in daemon.go
no default default number in names

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