Fixes documentation for remotehttp-backend.
Still needs clarification on the SSL information.
Polarssl: disable padlock
add priority to content for MX and SRV records
remove priority from api tests
remove priority in remote backend
remove priority in recursor
remove priority in geoip backend
remove priority in docs
remove priority in lua backend
Fix ordername for SOA record after update
Use transaction when updating serial
Use correct syntax for escapes
Merge pull request #1798 from James-TR/remote-backend-docs-fix

Fixes documentation for remotehttp-backend.
Make sure libremotebackend picks up correct flags

This fixes the build if we build with --disable-experimental-pkcs11
Always link libtestremotebackend with -ld

Not only when PKCS11 is enabled
After aed373029748 we need polarssl/version.h

So copy it into the dist dir
build distrecursor in travis
Only show apt errors

And skip the progress output
remove priority in oracle backend
remove priority in geo backend