Fix 2.0.0-RC1 Bugs

[hhund]

This is a tracking issue for bugs or other issues found in the 2.0.0-RC1 release:

• Typos in documentation annotations of fhir and bpe applications
• Documentation generator in dsf-maven-plugin, no output of "default value" for single character values
• TSP_USER, PPH_USER and BIO_USER missing in CodeSystem http://dsf.dev/fhir/CodeSystem/practitioner-role
• BPE application config parameter names include camunda
• Async search methods not implemented in DsfClient
• Sync and async methods to execute FHIR operations not implemented in DsfClient
• DsfClientProvider not working for non DSF FHIR servers
• DSF OrganizationAffiliation profile is missing preferred ValueSet binding to http://dsf.dev/fhir/ValueSet/organization-role
• FHIR Server root URL responding with inappropriate Cache-Control header
• FHIR validator prevents existing MII plugins to execute successfully