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Description of problem: 
cloudinit marker file("/var/lib/cloud/sem/config_scripts_per_once.once") not remove during deprovision process
This file is a marker for cloudinit module "scripts-per-once".So if not remove this file during deprovision process,while deploy a new VM use this,during the new VM's provision process, "scripts-per-once" module check the marker file exists,so the module will skip this module's follow code,and run the next module.
So this will cause some issues in some scenarious.

Version-Release number of selected component (if applicable): 
WALinuxAgent-2.2.11-upstream 

RHEL Version: 
RHEL-7.4/RHEL-6.9

How reproducible: 
100%

Steps to Reproduce: 
1. Prepare a RHEL7.4 VM in Azure. Install cloud-init，WALA and enable them while booting
(do not modify cloudinit configuration file)
2. Check "/var/lib/cloud/sem" folder
3. Do WALA deprovision process
4. Check "/var/lib/cloud/sem" folder


Actual results: 
For step 2:
there is one file exits in folder,named "config_scripts_per_once.once"
For step 4:
the file still exists

Expected results: 
Should clean up "/var/lib/cloud/sem/" folder

Additional info:
Now,WALA only clean up below folders,
pa/deprovision/default.py(line 102-106)

Fixed in WALA 2.2.12
See: https://github.com/Azure/WALinuxAgent/issues/721

Verified on RHEL 7.4-20170601.0 with WALinuxAgent-2.2.12-1 that this issue has resolved.

My steps:
  refer this issue's Description

Close this issue because WALinuxAgent-2.2.14-1.el7/6 has shipped.