tests/atsecure: avoid running bash under test domains

The 'env' utility can be used just as well. This avoids the "bash:
/root/.bashrc: Permission denied" error message that appears when the
testsuite is ran with a terminal attached to the stdout/stdin and the
corresponding AVC denials.

Signed-off-by: Ondrej Mosnacek <omosnace@redhat.com>

tests/atsecure/test

@@ -20,12 +20,12 @@ ok( $result, 0 );
 
 # Verify that LD_PRELOAD is ignored when noatsecure permission is not allowed.
 $result = system(
-"runcon -t test_atsecure_denied_t -- bash -c 'LD_PRELOAD=$basedir/evil.so runcon -t test_atsecure_newdomain_t $basedir/good'"
+"runcon -t test_atsecure_denied_t -- env LD_PRELOAD=$basedir/evil.so runcon -t test_atsecure_newdomain_t $basedir/good"
 );
 ok( $result, 0 );
 
 # Verify that LD_PRELOAD is honored when noatsecure permission is allowed.
 $result = system(
-"runcon -t test_atsecure_allowed_t -- bash -c 'LD_PRELOAD=$basedir/evil.so runcon -t test_atsecure_newdomain_t $basedir/good'"
+"runcon -t test_atsecure_allowed_t -- env LD_PRELOAD=$basedir/evil.so runcon -t test_atsecure_newdomain_t $basedir/good"
 );
 ok($result);