tests: Run perl via 'env'

The 'perl' binary may not be /usr/bin/perl, depending on the system.
For example, on modern FreeBSD it tends to be /usr/local/bin/perl
instead.

To avoid relying on perl to be in a specific location, just run via
/usr/bin/env instead, so we pick up perl from $PATH instead.

Change-Id: Ic8dc247c82342ff79dfa80426c489ccb8e3e1450
Reviewed-on: https://gerrit.openafs.org/14144
Tested-by: Andrew Deason <adeason@sinenomine.net>
Reviewed-by: Benjamin Kaduk <kaduk@mit.edu>

tests/bozo/bos-man-t

@@ -1,4 +1,4 @@
-#!/usr/bin/perl
+#!/usr/bin/env perl
 
 use strict;
 use warnings;

tests/bucoord/backup-man-t

@@ -1,4 +1,4 @@
-#!/usr/bin/perl
+#!/usr/bin/env perl
 
 use strict;
 use warnings;

tests/kauth/kas-man-t

@@ -1,4 +1,4 @@
-#!/usr/bin/perl
+#!/usr/bin/env perl
 
 use strict;
 use warnings;

tests/opr/softsig-t

@@ -1,4 +1,4 @@
-#!/usr/bin/perl
+#!/usr/bin/env perl
 #
 # Copyright (c) 2010 Your File System Inc. All rights reserved.
 #

tests/ptserver/pt_util-t

@@ -1,4 +1,4 @@
-#!/usr/bin/perl
+#!/usr/bin/env perl
 
 use strict;
 use warnings;

tests/ptserver/pts-man-t

@@ -1,4 +1,4 @@
-#!/usr/bin/perl
+#!/usr/bin/env perl
 
 use strict;
 use warnings;

tests/rx/perf-t

@@ -1,4 +1,4 @@
-#!/usr/bin/perl
+#!/usr/bin/env perl
 
 use strict;
 use warnings;

tests/venus/fs-man-t

@@ -1,4 +1,4 @@
-#!/usr/bin/perl
+#!/usr/bin/env perl
 
 use strict;
 use warnings;

tests/volser/vos-man-t

@@ -1,4 +1,4 @@
-#!/usr/bin/perl
+#!/usr/bin/env perl
 
 use strict;
 use warnings;