test: fix commandtest under autobuild.sh

* tests/commandtest.c (mymain): Kill off any leaked-in fds.
* autobuild.sh: Don't leak fds.
Signed-off-by: NEric Blake <eblake@redhat.com>

autobuild.sh

@@ -38,7 +38,7 @@ make install
 exec 3>&1
 st=$(
   exec 4>&1 >&3
-  { make check syntax-check 2>&1; echo $? >&4; } | tee "$RESULTS"
+  { make check syntax-check 2>&1 3>&- 4>&-; echo $? >&4; } | tee "$RESULTS"
 )
 exec 3>&-
 test "$st" = 0

tests/commandtest.c

@@ -688,6 +688,12 @@ mymain(int argc, char **argv)
     if (chdir("/tmp") < 0)
         return(EXIT_FAILURE);
 
+    /* Kill off any inherited fds that might interfere with our
+     * testing.  */
+    close(3);
+    close(4);
+    close(5);
+
     virInitialize();
 
     const char *const newenv[] = {