MFC r282436 (the portion that makes sense):

Remove "capability mode sandbox enabled" messages.

These messages serve little purpose and break some consumers.

PR:		199855
Differential Revision:	https://reviews.freebsd.org/D2440
Reviewed by:	rwatson
Approved by:	pjd
Sponsored by:	DARPA, AFRL

contrib/tcpdump/tcpdump.c

@@ -1618,8 +1618,6 @@ main(int argc, char **argv)
 	cansandbox = (nflag && VFileName == NULL && zflag == NULL);
 	if (cansandbox && cap_enter() < 0 && errno != ENOSYS)
 		error("unable to enter the capability mode");
-	if (cap_sandboxed())
-		fprintf(stderr, "capability mode sandbox enabled\n");
 #endif	/* __FreeBSD__ */
 
 	do {