periodic: Fix periodic reports when log files are not compressed.

The modern zcat(1) is capable of handling compressed and uncompressed
text files, so we can simply use zcat command.

PR:		253168
Reviewed by:	delphij
MFC after:	2 weeks
Differential Revision:	https://reviews.freebsd.org/D43357

(cherry picked from commit 1fa4ddcc6d)

usr.sbin/periodic/etc/security/800.loginfail

@@ -49,10 +49,7 @@ catmsgs() {
 	    sort -t. -r -n -k 2,2 |
 	    while read f
 	    do
-		case $f in
-		    *.gz)	zcat -f $f;;
-		    *.bz2)	bzcat -f $f;;
-		esac
+		zcat -f $f
 	    done
 	[ -f ${LOG}/auth.log ] && cat $LOG/auth.log
 }

usr.sbin/periodic/etc/security/900.tcpwrap

@@ -49,10 +49,7 @@ catmsgs() {
 	    sort -t. -r -n -k 2,2 |
 	    while read f
 	    do
-		case $f in
-		    *.gz)	zcat -f $f;;
-		    *.bz2)	bzcat -f $f;;
-		esac
+		zcat -f $f
 	    done
 	[ -f ${LOG}/messages ] && cat $LOG/messages
 }