add ability to override timezone in env.json
add ability to override timezone in env.json

knehez/xqueue,Marx86/xqueue,edx/xqueue,edx/xqueue,nttks/xqueue,nttks/xqueue,knehez/xqueue,knehez/xqueue,EDUlib/xqueue,edx/xqueue,Marx86/xqueue,EDUlib/xqueue,EDUlib/xqueue