Allow specifying a list of default sources
set whois.default.sources explicitly in the properties file
Skip default source if empty string
test default sources
Merge branch 'master' of github.com:APNIC-net/whois into defaultsources

* 'master' of github.com:APNIC-net/whois:
  don't automagically activate the APNIC profile
Merge branch 'master' of github.com:APNIC-net/whois

# By dragank
# Via dragank
* 'master' of github.com:APNIC-net/whois:
  SCRUM-1549 - Initial customisation of authnum authorisation
  SCRUM-1548 - Added Annotation for including/excluding spring beans from the contexts based on whois variant