Change FILE_PATH of a test file from /tmp/ to a local one

Change FILE_PATH from /tmp/file_provider to ./tmp_file_provider,
because it is safer (/tmp/ can be unavailable).

Signed-off-by: Lukasz Dorau <lukasz.dorau@intel.com>

Author: ldorau

test/pools/pool_coarse_file.hpp

@@ -14,6 +14,6 @@
 using umf_test::test;
 using namespace umf_test;
 
-#define FILE_PATH ((char *)"/tmp/file_provider")
+#define FILE_PATH ((char *)"tmp_file_provider")
 
 #endif /* UMF_TEST_POOL_COARSE_FILE_HPP */