tests: Make check-file-access.pl accept files through argv

The script needs two files to open:

  $(builddir)/test_file_access.txt, and
  $(srcdir)/file_access_whitelist.txt.

However, the script is opening the files from the $CWD which
won't work for a VPATH build. Make the script accept paths to the
files through @ARGV and tune the Makefile.am to pass them.
Signed-off-by: NMichal Privoznik <mprivozn@redhat.com>
Reviewed-by: NDaniel P. Berrangé <berrange@redhat.com>

tests/Makefile.am

@@ -454,7 +454,9 @@ EXTRA_DIST += $(test_scripts)
 if WITH_LINUX
 check-access: file-access-clean
 	VIR_TEST_FILE_ACCESS=1 $(MAKE) $(AM_MAKEFLAGS) check
-	$(PERL) check-file-access.pl | sort -u
+	$(PERL) $(abs_srcdir)/check-file-access.pl \
+		$(abs_builddir)/test_file_access.txt \
+		$(abs_srcdir)/file_access_whitelist.txt | sort -u
 
 file-access-clean:
 	> test_file_access.txt

tests/check-file-access.pl

@@ -24,8 +24,12 @@
 use strict;
 use warnings;
 
-my $access_file = "test_file_access.txt";
-my $whitelist_file = "file_access_whitelist.txt";
+sub usage {
+    die "$0 access_file file_access_whitelist\n";
+}
+
+my $access_file = shift or usage();
+my $whitelist_file = shift or usage();
 
 my @known_actions = ("open", "fopen", "access", "stat", "lstat", "connect");