Enable C++ unit test during build (sonic-net#1092)

* Enable test during build
* Exclude `tests` in the deb package

Makefile.am

@@ -1,9 +1,5 @@
-SUBDIRS = fpmsyncd neighsyncd portsyncd orchagent swssconfig cfgmgr
+SUBDIRS = fpmsyncd neighsyncd portsyncd orchagent swssconfig cfgmgr tests
 
 if HAVE_LIBTEAM
 SUBDIRS += teamsyncd
 endif
-
-if GTEST
-SUBDIRS += tests
-endif

configure.ac

@@ -34,15 +34,6 @@ AC_ARG_ENABLE(debug,
 esac],[debug=false])
 AM_CONDITIONAL(DEBUG, test x$debug = xtrue)
 
-AC_ARG_ENABLE(gtest,
-[  --enable-gtest       Compile with googletest flags],
-[case "${enableval}" in
-	yes) gtest=true ;;
-	no)  gtest=false ;;
-	*) AC_MSG_ERROR(bad value ${enableval} for --enable-gtest) ;;
-esac],[gtest=false])
-AM_CONDITIONAL(GTEST, test x$gtest = xtrue)
-
 CFLAGS_COMMON="-std=c++11 -Wall -fPIC -Wno-write-strings -I/usr/include/libnl3 -I/usr/include/swss"
 
 AM_CONDITIONAL(sonic_asic_platform_barefoot,   test x$CONFIGURED_PLATFORM = xbarefoot)

tests/Makefile.am

@@ -1,6 +1,8 @@
 CFLAGS_SAI = -I /usr/include/sai
 
-bin_PROGRAMS = tests
+TESTS = tests
+
+noinst_PROGRAMS = tests
 
 if DEBUG
 DBGFLAGS = -ggdb -DDEBUG
@@ -11,7 +13,7 @@ endif
 CFLAGS_GTEST =
 LDADD_GTEST = -L/usr/src/gtest
 
-tests_SOURCES = swssnet_ut.cpp request_parser_ut.cpp
+tests_SOURCES = swssnet_ut.cpp request_parser_ut.cpp ../orchagent/request_parser.cpp
 
 tests_CFLAGS = $(DBGFLAGS) $(AM_CFLAGS) $(CFLAGS_COMMON) $(CFLAGS_GTEST) $(CFLAGS_SAI)
 tests_CPPFLAGS = $(DBGFLAGS) $(AM_CFLAGS) $(CFLAGS_COMMON) $(CFLAGS_GTEST) $(CFLAGS_SAI) -I../orchagent

tests/request_parser_ut.cpp

@@ -8,6 +8,8 @@
 #include "orch.h"
 #include "request_parser.h"
 
+using namespace swss;
+
 const request_description_t request_description1 = {
     { REQ_T_STRING },
     {