tls: crt in local folder, auto trusted

Add the OpenStack services crt and the rsyslog logging cert into the
local directory to be picked up.
Any .crt files in /usr/local/share/ca-certificates are automatically
trusted by update-ca-certificates when run.

Based on man page found at:
http://manpages.ubuntu.com/manpages/precise/man8/update-ca-certificates.8.html