Add system:exec:root command

[s4mpl3d]

Analog to project:shell:root & project:shell

[sbaerlocher]

@s4mpl3d Thank you for the proposal regarding the system:exec:root command. Could you please clarify which container will be targeted by default if no name is provided?

[s4mpl3d]

@s4mpl3d Thank you for the proposal regarding the system:exec:root command. Could you please clarify which container will be targeted by default if no name is provided?

@sbaerlocher which container do you target with system:exec?