tests: check_disk_smb may exit with critical for unresponsive hosts too

Unknown (ex. debian 7)
%> ./check_disk_smb -H 1.1.1.1 -s np_foobar -vvv
/usr/bin/smbclient //1.1.1.1/np_foobar -U guest% -c du
No Answer from Client

Critical (ex. debian 8)
%> ./check_disk_smb -H 1.1.1.1 -s np_foobar -vvv
/usr/bin/smbclient //1.1.1.1/np_foobar -U guest% -c du
Connection to 1.1.1.1 failed
CRITICAL

Signed-off-by: Sven Nierlein <Sven.Nierlein@consol.de>

plugins-scripts/t/check_disk_smb.t

@@ -90,7 +90,7 @@ SKIP: {
 	SKIP: {
 		skip "no non responsive host defined", 1 if ( ! $host_nonresponsive );
 		$res = NPTest->testCmd( "./$plugin -H $host_nonresponsive -s np_foobar ");
-		cmp_ok( $res->return_code, '==', 3, "Exit UNKNOWN with non responsive host" );
+		cmp_ok( $res->return_code, '>=', 2, "Exit CRITICAL/UNKNOWN with non responsive host" );
 	}
 
 }