Fixes documentation for remotehttp-backend.
Still needs clarification on the SSL information.
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
report built-in PolarSSL version
Fix ordername for SOA record after update
Use transaction when updating serial
Merge pull request #1818 from mind04/polarversion

report built-in PolarSSL version
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
Only show apt errors

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