RFE: SELinux boolean to allow tomcat_t to send mail

Issue

Currently, creating a custom policy or turning on the nis_enabled boolean is required to grant tomcat_t the permission to send mails. This update can add e. g. the tomcat_can_sendmail SELinux boolean to the SELinux policy. Enabling such a boolean would permit tomcat_t to name_connect to smtp_port_t.