tests: correct PATH in new test, for when running manually

* tests/virsh-schedinfo: This test sets PATH internally, just in
case you're running it manually.  Normally, the PATH setting from
tests/Makefile.am's TESTS_ENVIRONMENT is sufficient.  Prepend the
correct directory, and take advantage of the PATH setting in one
more case.

tests/virsh-schedinfo

@@ -20,17 +20,17 @@
 : ${abs_top_srcdir=$(pwd)/..}
 : ${abs_top_builddir=$(pwd)/..}
 
-# If $abs_top_builddir/tools/virsh is not early in $PATH, put it there,
+# If $abs_top_builddir/tools is not early in $PATH, put it there,
 # so that we can safely invoke "virsh" simply with its name.
 case $PATH in
-  $abs_top_builddir/tools/src:$abs_top_builddir/tools/virsh:*) ;;
-  $abs_top_builddir/tools/virsh:*) ;;
-  *) PATH=$abs_top_builddir/tools/virsh:$PATH; export PATH ;;
+  $abs_top_builddir/tools/src:$abs_top_builddir/tools:*) ;;
+  $abs_top_builddir/tools:*) ;;
+  *) PATH=$abs_top_builddir/tools:$PATH; export PATH ;;
 esac
 
 if test "$VERBOSE" = yes; then
   set -x
-  $abs_top_builddir/tools/virsh --version
+  virsh --version
 fi
 
 . "$srcdir/test-lib.sh"