Description of problem:
The "Role.StateConsumer" in /etc/waagent.conf doesn't work.

Version-Release number of selected component (if applicable):
WALinuxAgent-2.1.5 (upstream, package by tester)

RHEL Version:
RHEL-7.3-20160729.1

How reproducible:
100%

Steps to Reproduce:
1. Prepare a RHEL7.3 VM on Azure. Make a script /root/test.sh:
# cat /root/test.sh
#!/bin/bash
PREFIX=`date`
echo "${PREFIX} test" >> /tmp/walatest.log
# chmod 755 /root/test.sh
2. restart waagent service
# systemctl restart waagent
3. Check if the script runs:
# cat /tmp/walatest.log

Actual results:
No logs in /tmp/walatest.log. The script doesn't run after waagent restart.

Expected results:
The script runs after waagent restart

Additional info:
1. In WALA-2.0.16 it worked.
2. Search for "Role." in WALA-2.1.5 source code. Except waagent2.0, there's no function to read "Role.StateConsumer" in azurelinuxagent/common/conf.py and no related features.