tests: add proptest

A small program that allows us to see and modify properties.

Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Signed-off-by: Rob Clark <robclark@freedesktop.org>
diff --git a/.gitignore b/.gitignore
index 38c6682..3596a4a 100644
--- a/.gitignore
+++ b/.gitignore
@@ -89,6 +89,7 @@
 tests/modeprint/modeprint
 tests/modetest/modetest
 tests/name_from_fd
+tests/proptest/proptest
 tests/kmstest/kmstest
 tests/vbltest/vbltest
 tests/radeon/radeon_ttm