pki: T6241: remove debug print statement about updated subsystems

Commit 9f9891a2099 ("pki: T6241: Fix dependency updates on PKI changes") added
a print() statement which notified the users about the subsystems which got
supplied with an updated certificate.

Example:

PKI: Updating config: interfaces openvpn vtun0 tls certificate openvpn_vtun0
PKI: Updating config: interfaces openvpn vtun0 tls ca_certificate openvpn_vtun0_1

This is an informational message which should maybe (if needed) be sent to
syslog. But the main issue is that CLI paths are mangled (- to _) which makes
the about print output wrong and could potentially confuse users.

Statement has been commented to be re-enabled for debugging.