Rename dynamic_ui package and normalize it.

* Move muranodashboard.environments.services package to
  muranodashboard.dynamic_ui.
* Move all code from dynamic_ui/__init__.py to dynamic_ui/services.py
  thus having normal empty __init__.py for dynamic_ui package (as in
  other packages).

Change-Id: I395ee621578cb417314fe4960d74108deb848023