muhhshoaib/security-change-user-password-requirements-685:changed user password requirement

muhhshoaib/security-change-user-password-requirements-685: password complexity levels are now configurable https://github.com/edx-solutions/edx-platform/pull/59

muhhshoaib/security-change-user-password-requirements-685:updated sample default configuration settings https://github.com/edx-solutions/edx-platform/pull/59