Explicitly set up ECS config dir in spec files

[danehlim]

Summary

Explicitly make sure that ECS config directory (e.g., /etc/ecs) is created and owned by ecs-init package when ecs-init package is installed.

Current behavior is that this directory is created implicitly elsewhere and not owned by ecs-init, which should not be the case.

Implementation details

Ensure %dir %{_sysconfdir}/ecs is present under %files section in spec files.

Testing

Run the following commands on an EC2 instance to build and install ecs-init RPM package with the changes from this pull request:

# Stop ECS service.
sudo systemctl stop ecs
# Uninstall ecs-init.
sudo yum remove -y ecs-init
# Delete any existing ECS config directory and files.
sudo rm -rf /etc/ecs
# Build ecs-init RPM package with the changes from this pull request.
make generic-rpm-integrated
# Install the ecs-init RPM built by running the previous command.
sudo yum localinstall -y /home/ec2-user/go/src/github.com/aws/amazon-ecs-agent/amazon-ecs-init-1.82.1-1.x86_64.rpm
# Start ECS service.
sudo systemctl start ecs

Then confirm that ECS config directory is set up correctly and owned by ecs-init:

$ ls -la /etc/ecs
total 16
drwxr-xr-x.  2 root root     6 Apr  1 18:25 .
drwxr-xr-x. 78 root root 16384 Apr  1 18:29 ..
$ rpm -qf /etc/ecs
amazon-ecs-init-1.82.1-1.x86_64

Also ran automated unit, integration, and functional tests.

New tests cover the changes: no

Description for the changelog

Explicitly set up ECS config dir in spec files

Does this PR include breaking model changes? If so, Have you added transformation functions?
No

Licensing

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.