Code review comment for ~mitchdz/ubuntu/+source/ec2-hibinit-agent:add-IMDSv2-focal

This has been tested to work on Focal

us-west-2 was used as the region for aws (this is important because AMI will change)

# To test the failure
1. Create an amazon EC2 instance with the following properties
   - AMI - ami-0bb56dbe79558e0f0 (For Focal)
   - t2.micro
   - encrypted 8GB EBS volume with default key
   - Stop - Hibernate behavior: Enable
   - Metadata accessible : Enable
   - Metadata version Info : V2 only (token required)
2. Wait for instance to say "Running"
3. ssh into your instance
4. Create a test program
```
/bin/cat <<EOM >~/allocate_mem.py
#!/usr/bin/python3
import time

# Allocate 200MB chunk of memory
size = 200 * 1024 * 1024 # 200MB
memory_chunk = bytearray(size)

print("Allocated 200MB of memory.")

# Enter indefinite loop
while True:
    time.sleep(1) # Wait for 1 second

# The script will never reach this point
EOM
```
5. Run a background process
```
python3 ~/allocate_mem.py &
```
6. Hibernate the instance
7. Wait for Instance to be in "Stopped" State
8. Start the intsance
9. ssh into instance
10. Check that the process is running
$ ps aux | grep allocate_mem | grep -v grep
$

# To test the fix
1. Create an amazon EC2 instance with the following properties
   - AMI - ami-0bb56dbe79558e0f0 (For Focal)
   - t2.micro
   - encrypted 8GB EBS volume with default key
   - Stop - Hibernate behavior: Enable
   - Metadata accessible : Enable
   - Metadata version Info : V2 only (token required)
2. Wait for instance to say "Running"
3. ssh into your instance
4. add PPA for updated package; apt update && apt upgrade
```
sudo add-apt-repository ppa:mitchdz/ec2-hibinit-agent-add-imdsv2-support -y
sudo apt update -y && sudo apt upgrade -y
```
5. Create a test program
```
/bin/cat <<EOM >~/allocate_mem.py
#!/usr/bin/python3
import time

# Allocate 200MB chunk of memory
size = 200 * 1024 * 1024 # 200MB
memory_chunk = bytearray(size)

print("Allocated 200MB of memory.")

# Enter indefinite loop
while True:
    time.sleep(1) # Wait for 1 second

# The script will never reach this point
EOM
```
6. Run a background process
```
python3 ~/allocate_mem.py &
```
7. Hibernate the instance
8. Wait for Instance to be in "Stopped" State
9. Start the instance
10. ssh into instance
11. Check that the process is running
$ ps aux | grep allocate_mem | grep -v grep
ubuntu 2532 1.1 23.0 221948 213248 pts/0 S 13:43 0:00 python3 /home/ubuntu/allocate_mem.py