[19.03 backport] plugin fixes#1878

Merged

tiborvass merged 5 commits intodocker:19.03from

thaJeztah:19.03_plugin_fixes

May 13, 2019

Commits on May 13, 2019

Move subtests of TestGlobalHelp into actual subtests

Ian Campbell
authored and
thaJeztah
committed
Hide experimental builtin commands in help output on unknown flag.

Ian Campbell
authored and
thaJeztah
committed
Include CLI plugins in help output on unknown flag.

Ian Campbell
authored and
thaJeztah
committed
Use command.Cli instead of command.DockerCli

Ian Campbell
authored and
thaJeztah
committed
cli-plugins: fix when plugin does not use PersistentPreRun* hooks

Ian Campbell
authored and
thaJeztah
committed