Recommend trivial parity

[allanrogerr]

Issue summary

In the minio operator console, when creating a tenant, the user is not able to select any different EC Parity than an invalid EC:4 or EC:2.
See #1901 for more details

Test summary

Test 0 - Reproduce issue on master.

1. As reported by user, attempt to create a tenant with 1 node and 1 drive with 1GiB storage Observe no valid parity EC:0 available
2. Also observe that if an invalid Resource is specified, then the user navigates away then back to the main create page, the Create button is enabled incorrectly.
3. Also observe that if multiple parities were selectable using a particular drive/server configuration e.g. 4 nodes, 8 drives (giving EC:8,7,6,5,4,3,2, THEN a 1 node 1 drive configuration were selected that those same parities EC:8,7,6,5,4,3,2 are selectable still, even though they cannot be applied to a 1 node 1 drive configuration.

Fix on recommend-trivial-parity branch
Test 1 - As reported by user, attempt to create a tenant with 1 node and 1 drive with 1GiB storage Observe valid parity EC:0 is now available
Test 2 - Actually create the tenant and validate its storage

Verbose tests here:
https://github.com/allanrogerr/public/wiki/operator%E2%80%901901

Fixes: #1901

[shtripat]

LGTM. Verified.