[BUG] Some parameter changes are not in waagent.conf

[yuxisun1217]

Describe the bug: A clear and concise description of what the bug is.
In v2.2.45 there are some parameter changes. But they are not in waagent.conf:
Provisioning.Agent is not added
Provisioning.Enabled and Provisioning.UseCloudInit are not removed

Distro and WALinuxAgent details (please complete the following information):

• Distro and Version: RHEL-7/8
• WALinuxAgent version: v2.2.47

Steps to Reproduce:

1. cat /etc/waagent.conf

Actual results:

# Enable instance creation
Provisioning.Enabled=y

# Rely on cloud-init to provision
Provisioning.UseCloudInit=n

Expected results:
Something like this:

# Choose which provisioning agent to use (or allow waagent to figure it out by specifying "auto"). Possible options are "auto" (default), "waagent", "cloud-init", or "disabled".
Provisioning.Agent=auto

[pgombar]

Fixed in #1853