[ADE] ImportError: Can't load waagent

I am getting an error when trying to encrypt disks on a Redhat 8.2 VM.

## Info
```
# waagent --version
WALinuxAgent-2.2.46 running on redhat 8.2
Python: 3.6.8
Goal state agent: 2.2.52
```
## Error
```
[ExtensionOperationError] Non-zero exit code: 1, /var/lib/waagent/Microsoft.Azure.Security.AzureDiskEncryptionForLinux-1.1.0.52/extension_shim.sh -c main/handle.py --install
[stdout]
Python 2.7.17
Traceback (most recent call last):
File "main/handle.py", line 32, in
from Utils import HandlerUtil
File "/var/lib/waagent/Microsoft.Azure.Security.AzureDiskEncryptionForLinux-1.1.0.52/main/Utils/HandlerUtil.py", line 71, in
from Utils.WAAgentUtil import waagent
File "/var/lib/waagent/Microsoft.Azure.Security.AzureDiskEncryptionForLinux-1.1.0.52/main/Utils/WAAgentUtil.py", line 41, in
waagent = imp.load_source('waagent', agentPath)
File "/usr/sbin/waagent", line 46, in
raise ImportError("Can't load waagent")
ImportError: Can't load waagent
```

Start with the ADE extension entry point main/handle.py and trace its imports through Utils/HandlerUtil.py and Utils/WAAgentUtil.py to the /usr/sbin/waagent path shown in the traceback. Reproduce the install on the stated Red Hat 8.2 and Python versions and establish a confirmed fix for the ImportError; done means the extension install no longer exits with code 1.

Written by the indexing model from the issue text.