Add UTs to demonstrate problem
Change spec to allow colons in ccf
Expect correct number of characters written
Merge remote-tracking branch 'origin/master' into ipv6_pcfa
Take master PJSIP
Remove debugging printf
Update memento
Merge pull request #787 from Metaswitch/ipv6_pcfa

[Reviewer: Mike] Don't mangle PCFA headers that are IPv6 addresses