Add p11-kit-1 support

Skeleton for PKCS#11 signers

Add exceptions for key format

Rudimentary version, still needs cleanup

Some small tweaks for pkcs11

Remove dnssecinfra.cc from zone2*

Use pkcs11 when such file is detected

Code cleanup

Added pkcs11signers to test suite builds

Added few comments

Support key creation

Add p11-kit-1 support

Skeleton for PKCS#11 signers

Add exceptions for key format

Rudimentary version, still needs cleanup

Some small tweaks for pkcs11

Code cleanup

Added few comments

Support key creation

Avoid base64 for PKCS11 attributes

hsm assign and hsm create-key methods
pdnssec hsm assign and create-key