The CertDB class was meant to be a wrapper around NSS databases,
certutil, pk12util, etc. Unfortunately, over time it grew too
dependent on the particular scenarios it is used in.
Introduce a new class that has no knowledge about IPA configuration,
and move generic code to it.
In the future, generic code should be moved to NSSDatabase, code
for the self-signed CA should be removed, and IPA-specific code may
stay in CertDB (which calls NSSDatabase).
Petr Viktorin
1e86378d49