Sanitize ds-rdata attribute: drop spaces and parentheses in the digest
Add some test ds-rdata data containing ()

TODO for adding sanitize tests
Add sanitizer tests for ds-rdata
Merge pull request #31 from APNIC-net/to-upstream-sanitize-ds-rdata

Sanitize ds-rdata attributes (review coming up)
removed {source} from pathparams where does not apply
(effectively everywhere but lookup; search has had it as queryparam already)
This is in preparation of deployment, vast simplification of rewriterules config
simplify ds-rdata sanitizer code
fixed todo regarding as-block search key validation