DAOS-17946 pool,cont: change default properties

[johannlombardi]

Change several default pool and container properties to better aligned with what is used in production. This includes:

• crc32 checksum and server-side checksum validation on on containers by default
• space reservation (space_rb) for rebuild is now set to 5% by default
• RF3 is the default on containers and pools
• the default EC cell size has been bumped from 64k to 128k

Steps for the author:

• [ ] Commit message follows the guidelines.
• [ ] Appropriate Features or Test-tag pragmas were used.
• [ ] Appropriate Functional Test Stages were run.
• [ ] At least two positive code reviews including at least one code owner from each category referenced in the PR.
• [ ] Testing is complete. If necessary, forced-landing label added and a reason added in a comment.

After all prior steps are complete:

• [ ] Gatekeeper requested (daos-gatekeeper added as a reviewer).

[github-actions[bot]]

Ticket title is 'Document better Defaults for DAOS (RF3, cell size, etc)' Status is 'In Progress' Labels: '2.8pp,scrubbed_2.8' Errors are Unknown component https://daosio.atlassian.net/browse/DAOS-17946

[daosbuild3]

Test stage Test RPMs on EL 8.6 completed with status FAILURE. https://jenkins-3.daos.hpc.amslabs.hpecorp.net//job/daos-stack/job/daos/view/change-requests/job/PR-17032/4/execution/node/1014/log

[daosbuild3]

Test stage Functional on EL 8.8 completed with status UNSTABLE. https://jenkins-3.daos.hpc.amslabs.hpecorp.net/job/daos-stack/job/daos//view/change-requests/job/PR-17032/4/testReport/