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Description of problem: 

WALA cannot write sudoer string to /etc/sudoers.d/waagent during provisioning.
Version-Release number of selected component (if applicable): 
WALinuxAgent-2.2.15-upstream 

RHEL Version: 
RHEL-7.4

How reproducible: 
100%

Steps to Reproduce: 
1. Prepare a RHEL7.4 VM in Azure. Install WALA and enable it while booting
2. cat /etc/sudoers.d/waagent

Actual results: 
The /etc/sudoers.d/waagent file is empty

Expected results:
There should be azureuser ALL=(ALL) ALL in /etc/sudoers.d/waagent(if authenticate with password)

Additional info:
/usr/lib/python2.7/site-packages/azurelinuxagent/common/osutil/default.py Line#284:
fileutil.findstr_in_file(sudoers_wagent, sudoer) is None:
should be:
fileutil.findstr_in_file(sudoers_wagent, sudoer) is False:
Because the return value of fileutil.findstr_in_file() function is True of False, never be None.

This is a regression bug that seems caused by this fix:
https://github.com/Azure/WALinuxAgent/issues/791

Fixed in WALA 2.2.18
https://github.com/Azure/WALinuxAgent/pull/894

Verified in WALA 2.2.18 upstream pre-release package. Will verify again in our WALA-2.2.18-1 rpm package.

Verified in WALinuxAgent-2.2.18-1.el7 in RHEL-7.4 ondemand image. 
Result: PASS