upd: clarify user/pass help strings
upd: clarify user/pass help strings

circonus-labs/circonus-one-step-install,circonus-labs/circonus-one-step-install,circonus-labs/circonus-one-step-install,maier/circonus-one-step-install,maier/circonus-one-step-install,maier/circonus-one-step-install