Deprecate log4j-hotpatch OCI hook

[arnaldo2792]

Issue number:

Closes #3399

Description of changes:

Remove the log4j hotpatch functionality and deprecate the setting. Clean up unused packages.

Testing done:

In aws-ecs-1:

• Migration testing from an adhoc build of 1.14.3 to 1.15, I validated that the deprecation message was logged, and on downgrade, I validated the hotpatch was still applied
• In a 1.15 build, I validated the deprecation message was logged, and the hotpatch wasn't applied
• In a running system, I validated the deprecation message was logged after the log4j-hotpatch-enabled settings was set to true

Terms of contribution:

By submitting this pull request, I agree that this contribution is dual-licensed under the terms of both the Apache License, version 2.0, and the MIT license.

[arnaldo2792]

Forced push includes:

• Bold format in README as suggested
• Removed new lines from Cargo.toml
• Keep oci-hooks defaults to generate shimpei`s hooks

[bcressey]

Tested the downgrade path for aws-ecs-1 after launching a new image with the setting enabled.

Downgrade to 1.14.3:

Welcome to Bottlerocket OS 1.14.3 (aws-ecs-1)!
...
[    4.221136] migrator[444]: 00:51:16 [INFO] Running migration 'migrate_v1.15.0_deprecate-log4j-hotpatch-enabled.lz4'
[    4.346781] migrator[444]: 00:51:16 [INFO] Running migration 'migrate_v1.15.0_log4j-hotpatch-enabled-metadata.lz4'
...

bash-5.1# find /var/lib/bottlerocket/datastore/current/ -name '*log4j*'
/var/lib/bottlerocket/datastore/current/live/settings/oci-hooks/log4j-hotpatch-enabled

bash-5.1# cat /etc/shimpei/shimpei-hooks.json
{
  "hooks": {
    "prestart": [
      { "path": "/usr/libexec/hotdog/hotdog-cc-hook" }
    ],
    "poststart": [
      { "path": "/usr/libexec/hotdog/hotdog-poststart-hook" }
    ]
  }
}

Upgrade to 1.15.0 again:

Welcome to Bottlerocket OS 1.15.0 (aws-ecs-1)!
...
[    4.626589] migrator[443]: 00:54:45 [INFO] Running migration 'migrate_v1.15.0_log4j-hotpatch-enabled-metadata.lz4'
[    4.723218] migrator[443]: 00:54:45 [INFO] Running migration 'migrate_v1.15.0_deprecate-log4j-hotpatch-enabled.lz4'
...

bash-5.1# find /var/lib/bottlerocket/datastore/current/ -name '*log4j*'
/var/lib/bottlerocket/datastore/current/live/services/log4j-hotpatch-enabled
/var/lib/bottlerocket/datastore/current/live/configuration-files/log4j-hotpatch-enabled-log-message
/var/lib/bottlerocket/datastore/current/live/settings/oci-hooks/log4j-hotpatch-enabled.affected-services
/var/lib/bottlerocket/datastore/current/live/settings/oci-hooks/log4j-hotpatch-enabled

bash-5.1# cat /etc/shimpei/shimpei-hooks.json
{
  "hooks": {
    "prestart": [
    ],
    "poststart": [
    ]
  }
}

bash-5.1# cat /etc/deprecated-settings/log4j-hotpatch-enabled
DEPRECATED_SETTING=oci-hooks.log4j-hotpatch-enabled