[3.0.0] command should not claim to support check mode

[felixfontein]

SUMMARY

Right now the command module claims that it supports check mode. This is wrong, as it does not (it has no clue whether the commands it executes do changes or not). We should change this in 3.0.0.

(We shouldn't change it earlier since there might be a lot of roles and playbooks that depend on it, and for them it will be a breaking change.)

ISSUE TYPE

• Bug Report

COMPONENT NAME

command