hci: remove bool from hci_reserve_packet_buffer and similiar higher layer functions

test: use bool for gap_reconnect_security_setup_active

test: use GAP_SUBEVENT_LE_CONNECTION_COMPLETE

att_dispatch: use bool for can send now functions

test/gatt_server/mock: add cmac_ready setter

test/gatt_server: set address type

test/gatt_server: implement gap_get_connection_type mock

test/gatt_server: test connection complete and disconnect events

test/gatt_server: control L2CAP_EVENT_CAN_SEND_NOW event

test/gatt_server: integrate mock TLV

test/gatt_server: mock att_dispatch

test: update return types for some mock functions

test: fix build

test; fix build

test: fix c/c++ mixed compile warning, streamline makefile

gatt_server_test: test indicate

gatt_server_test: prepare testing environment

test/gatt_server: add all gatt services to coverage

test: add gatt server to coverage