Disable the RAPI CA checks in watcher

Since the RAPI certificate is not necessarily self-signed, and we
currently don't have any configuration variable for the real CA file, we
disable for now the CA checks. This fixes the 'restart RAPI every 5
minutes' problem with non-self-signed certs.

Signed-off-by: Iustin Pop <iustin@google.com>
Reviewed-by: Michael Hanselmann <hansmi@google.com>