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