Saharaclient must be installed for UI to work in dev environment

Since in dev install guide we create a symlink to saharadashboard instead
of installing it, its dependencies are not installed automatically. So we
need to manually install saharaclient. Thanks to Yaroslav for finding
that issue.

Change-Id: I319ff3aaf6df86e473d4b0206f9769938074c6f8
Merge "Saharaclient must be installed for UI to work in dev environment"