Backport fence_ec2 support to Focal and Bionic

[Rafael David Tinoco]

In Bug:

https://bugs.launchpad.net/ubuntu/+source/cluster-glue/+bug/1895355

I have backported fixes and a new feature to cluster-glue:

# ec2 stonith agent support and fixes

7c84a6ae Fix EC2 stonith plugin
27e83692 Fix: stonith:ibmhmc: Add "managedsyspat" and "password" as supported parameters
[76138dfb Medium: external/ec2: Mitigate fence race (bsc#1088656)
6734e0d0 High: external/ec2: Avoid unicode errors and improve performance (bsc#1088656)
ba5710b3 Dev: external/ec2: Clean up whitespace
609cc386 Fix: stonith:external/ec2: Enforce en_US.UTF-8 locale when invoking aws client (bsc#1059171)
0f081f69 Medium: stonith: external/ec2: use target's uname as default for port
291a4378 Dev: stonith: external/ec2: protect unknown_are_stopped expansion
5cd5ffd2 Dev: stonith: external/ec2: add unknown_are_stopped to getconfignames
289e8fd3 Low: stonith: external/ec2: update name in the short description
b7bed186 Dev: update permissions for ec2
de5e068d High: stonith: external/ec2: new agent for aws/ec2

This bug is an attempt of backporting the agent to Focal and Bionic (LTS releases).

[Lucas Kanashiro (lucaskanashiro)]

I am marking this bug as Won't Fix because the recommended way to fence nodes on AWS is using the fence_aws agent present in the fence-agents packages (already available in Bionic and Focal).