Diagnostics extension invalid syntax

From the following error in log with fresh installation

2020-12-09T04:09:59.087477Z ERROR ExtHandler ExtHandler Event: name=Microsoft.Azure.Diagnostics.LinuxDiagnostic, op=Install, message=eJytkbtOw0AQRfv9iqs0ASlexwo07iJhKh4FZWKkxZ5YIy2z1uw6OEH8O8ZC8AEw1dUp5ozm7qoxkUQO8tiTujSFSjVojYcg2Zk0gEZOaEJLJYoV8qPT3PNL/uZcR5Lye240xHBIdnselOwNu05CTNxEe8cyjL8g29i1LTZF3v4g25+QscTkvDe7mNowpNqYOZJqbYBb9oTF/3sXK3gWwvXVJAF6ZUlYbuFD4zz4tQ+acEG2syt8Sy9xcNM1rUU1NtR/favE+/pjL0vs5y1/m2fzdJLkxrmCEixH57lFnKH5BKHqhhA=, duration=0

```
$ echo 'eJytkbtOw0AQRfv9iqs0ASlexwo07iJhKh4FZWKkxZ5YIy2z1uw6OEH8O8ZC8AEw1dUp5ozm7qoxkUQO8tiTujSFSjVojYcg2Zk0gEZOaEJLJYoV8qPT3PNL/uZcR5Lye240xHBIdnselOwNu05CTNxEe8cyjL8g29i1LTZF3v4g25+QscTkvDe7mNowpNqYOZJqbYBb9oTF/3sXK3gWwvXVJAF6ZUlYbuFD4zz4tQ+acEG2syt8Sy9xcNM1rUU1NtR/favE+/pjL0vs5y1/m2fzdJLkxrmCEixH57lFnKH5BKHqhhA=, duration=0' | base64 -d | pigz -zd
base64: invalid input
[ExtensionOperationError] Non-zero exit code: 1, /var/lib/waagent/Microsoft.Azure.Diagnostics.LinuxDiagnostic-3.0.131/diagnostic.py -install
[stdout]

[stderr]
File "/var/lib/waagent/Microsoft.Azure.Diagnostics.LinuxDiagnostic-3.0.131/diagnostic.py", line 54
print 'A local import (e.g., waagent) failed. Exception: {0}\n' \
^
SyntaxError: invalid syntax
[waagent.log](https://github.com/Azure/azure-linux-extensions/files/5670484/waagent.log)

```

Environment:
OS: Red Hat Enterprise Linux release 8.2 (Ootpa)
Agent WALinuxAgent-2.2.52

Start with the fresh-install failure on Red Hat Enterprise Linux 8.2 and inspect diagnostic.py at line 54, using the provided extension command and log as the reproduction path. Verify the installation no longer reports the Python SyntaxError or a non-zero exit code.

Written by the indexing model from the issue text.