[IBP] Set UTC timezone by default
[IBP] Set UTC timezone by default

Timezone on slave nodes was set to 'America/Los_Angeles' (PDT) by
default, meanwhile UTC was set on master node.

This patch will set UTC timezone for slave nodes, too.

Change-Id: Ib2dc3883de9523ab29ea67f128b2bb43e00a8aff
Closes-Bug: #1424701

prmtl/fuel-web,SmartInfrastructures/fuel-web-dev,zhaochao/fuel-web,nebril/fuel-web,prmtl/fuel-web,stackforge/fuel-web,prmtl/fuel-web,nebril/fuel-web,SmartInfrastructures/fuel-web-dev,huntxu/fuel-web,SmartInfrastructures/fuel-web-dev,eayunstack/fuel-web,nebril/fuel-web,stackforge/fuel-web,nebril/fuel-web,SmartInfrastructures/fuel-web-dev,SmartInfrastructures/fuel-web-dev,eayunstack/fuel-web,zhaochao/fuel-web,prmtl/fuel-web,huntxu/fuel-web,zhaochao/fuel-web,prmtl/fuel-web,eayunstack/fuel-web,huntxu/fuel-web,eayunstack/fuel-web,zhaochao/fuel-web,zhaochao/fuel-web,stackforge/fuel-web,huntxu/fuel-web,nebril/fuel-web,eayunstack/fuel-web,huntxu/fuel-web