Fix typo in ConfigurationAPIUserV1.acquire_lease docstring.
Fix typo in ConfigurationAPIUserV1.acquire_lease docstring.

AndyHuu/flocker,wallnerryan/flocker-profiles,w4ngyi/flocker,agonzalezro/flocker,w4ngyi/flocker,AndyHuu/flocker,mbrukman/flocker,wallnerryan/flocker-profiles,agonzalezro/flocker,wallnerryan/flocker-profiles,w4ngyi/flocker,hackday-profilers/flocker,AndyHuu/flocker,hackday-profilers/flocker,hackday-profilers/flocker,mbrukman/flocker,mbrukman/flocker,agonzalezro/flocker