Add unit tests for policy::find()

Test that everything works when passing in a property
map that contains an error message and the additional
data.  This exercises the code that finds a search
modifier.

Change-Id: If3abcea41aa1f98b97262f1e8a0483e1772e9842
Signed-off-by: Matt Spinler <spinler@us.ibm.com>
diff --git a/test/Makefile.am b/test/Makefile.am
index bbb71b5..a699696 100644
--- a/test/Makefile.am
+++ b/test/Makefile.am
@@ -12,5 +12,6 @@
 test_policy_SOURCES = test_policy.cpp
 test_policy_LDADD = \
 	$(top_builddir)/policy_table.o \
+	$(top_builddir)/policy_find.o \
 	-lstdc++fs \
 	$(SDBUSPLUS_LIBS)