[unit] Adopt to service.c and provider changes in service test. JB#48769

Remove use of the VPN dependency from the unit test. Remove connection.c
build dependency and replace functions with dummies.

Add provider family and VPN phy index dummies.

Use service_hash and add provider dummy to have the service_hash
supported within the test.

connman/Makefile.am

@@ -370,7 +370,7 @@ unit_test_service_SOURCES = $(backtrace_sources) $(gdhcp_sources) \
 				$(gweb_sources) $(shared_sources) \
 				unit/test-service.c \
 				src/connman.h src/log.c src/error.c src/task.c \
-				src/device.c src/network.c src/connection.c \
+				src/device.c src/network.c \
 				src/manager.c src/agent-connman.c src/clock.c \
 				src/timezone.c src/agent.c src/notifier.c \
 				src/resolver.c src/ipconfig.c src/detect.c \