Pass password using -P when creating new user in OMERO-start-*

This commit should fix OMERO-trunk-components/component=start,label=linux/
time out on new user creation.
Merge pull request #763 from sbesson/rebased/dev_4_4/omero-start_fix

Pass password using -P when creating new user in OMERO-start-* (rebased onto dev_4_4)