[bin/agent] Sleep before getting system info
[bin/agent] Sleep before getting system info

To avoid providing inconsistent info the agent should
make a sleep call before it collects system information.

https://mirantis.jira.com/browse/PRD-2288

Change-Id: I1d015f2bc94c4ee1ee94c8fda6d08ced45c4b07c

prmtl/fuel-web,eayunstack/fuel-web,prmtl/fuel-web,SmartInfrastructures/fuel-web-dev,zhaochao/fuel-web,zhaochao/fuel-web,nebril/fuel-web,zhaochao/fuel-web,nebril/fuel-web,zhaochao/fuel-web,koder-ua/nailgun-fcert,nebril/fuel-web,koder-ua/nailgun-fcert,SmartInfrastructures/fuel-web-dev,zhaochao/fuel-web,eayunstack/fuel-web,nebril/fuel-web,eayunstack/fuel-web,nebril/fuel-web,prmtl/fuel-web,huntxu/fuel-web,eayunstack/fuel-web,huntxu/fuel-web,SmartInfrastructures/fuel-web-dev,SmartInfrastructures/fuel-web-dev,stackforge/fuel-web,huntxu/fuel-web,prmtl/fuel-web,stackforge/fuel-web,koder-ua/nailgun-fcert,prmtl/fuel-web,stackforge/fuel-web,huntxu/fuel-web,eayunstack/fuel-web,koder-ua/nailgun-fcert,huntxu/fuel-web,SmartInfrastructures/fuel-web-dev