Remove CA key password from cert setup

Password protection in the current implementation is not actually
applied despite the presence of the ca_password config
option. Password protection is of marginal benefit because the
password must be stored in a file using the same protections afforded
to the key file. Password protection currently is not utilized with
externally provided keys.

Remove the ca_password config option and remove the use of the various
password related options to the OpenSSL commands whose net effect was
not actually accomplishing anything.

See the bug report for a thorough description of the issues.

Change-Id: Iaeb97f2338c4d3c6e770b410dee8f1b62778b561
Fixes: Bug #1214016
Merge "Remove CA key password from cert setup"