This update for sendmail fixes the following issues:

Add upstream patch 8.15.2.mci.p0:

* If sendmail tried to reuse an SMTP session which had already been
closed by the server, then the connection cache could have invalid
information about the session. One possible consequence was that
STARTTLS was not used even if offered.

* The former deprecated macro RES_USE_INET6 is gone with glibc 2.30

Removal of the SuSEfirewall2 service file, since SuSEfirewall2 has been replaced by
firewalld.