Issue 187 enable skipped ztest suites (#189)

* Fix some ztests that were skipped

* Expose bacapp_same_value()

* Fix bacapp, ptransfer tests

* Fix bugs in Load_Control object & tests

* refactor days functions from datetime module

* fix legacy ctests

* Add bacnet/basic/sys/days.[ch] to Zephyr build

* Update ztest to match from Zephyr v2.6.0; update ringbuf, datetime to build

* Fixup ztest test for object/acc

* Fix bvlc_address_from_ascii; enable/fix bvlc test

* Comment cleanup

* test/bacnet/basic/object/lc partially enabled

* Fix bacapp_decode_data_len return status on erroneous input

* fix ztest include fatal error

* fix ztest strsignal reference fatal error

* fix zassert_mem_equal reference syntax error

* fix zassert_mem_equal reference syntax error

Co-authored-by: Gregory Shue <gregory.shue@legrand.us>
Co-authored-by: Steve Karg <skarg@users.sourceforge.net>

test/bacnet/datalink/bvlc/CMakeLists.txt

@@ -39,6 +39,7 @@ add_executable(${PROJECT_NAME}
 	${SRC_DIR}/bacnet/bacreal.c
 	${SRC_DIR}/bacnet/bacstr.c
 	${SRC_DIR}/bacnet/basic/sys/bigend.c
+	${SRC_DIR}/bacnet/basic/sys/days.c
     # Test and test library files
 	./src/main.c
 	${ZTST_DIR}/ztest_mock.c