test: put each arg in a separate string

Each arg to docker run should be placed in a separate string.
Otherwise, when starting the command via exec.Cmd, the command is
interpreted as "echo test", which can't be found.
test: fix TestCreateStartRestartStopStartKillRm

cat needs stdin opened, otherwise it dies immediately.
test: skip TestCreate on Fedora due to lxc utils bug

In the dind environment running on a Fedora host, the lxc utils get
confused by the /sys/fs/cgroup/cpuacct,cpu cgroup mount and lxc-start
fails trying to access the wrong cgroup directory.
test: 2 second timeout (not 2000)
test: fix TestRmi race condition
test: remove extra args in TestExitCode

The extra blank argument isn't needed and confuses libvirt.
speedup docker ps
improve tests on the engine
rename file to remove testing flags from docker binary
resize pty after starting

Since ptyMaster is created during container start (startPty), it should
resized after starting, not before.
Merge pull request #2788 from jpoimboe/resize-after-start

resize pty after starting
Merge pull request #2747 from jpoimboe/test-fixes

Test fixes
Merge pull request #2760 from dotcloud/improve_engine_test

improve tests on the engine
Merge pull request #2773 from dotcloud/speed_up_docker_ps

speedup docker ps