Update(dock): Fixed dockutil install and added pause for position setting

[glennbrown]

I added a become and become_user option that matches the homebrew role without it the dockutil fails to install and will prompt for password in the middle of the play even with --ask-become-pass being passed. This fixes the install issue.

Added a sleep in the position setting task that matches the others, without it I was having a lot of issues with position getting set reliably.