bug fixes in virtualization and CoapClient, add virtualization tests
This MR addresses the following tasks: oniro#287 (closed) oniro#291 (closed)
- linux/CoapClient: fix token being reused after new session is created
- linux/virtualization: fix return of destroyed string
- virt_server: add exampleres flag to add mock resources
- .ci/Dockerfile: add apt install dbus and add script to run dbus-daemon
- virtualization_tests: add virtualization tests
Signed-off-by: Francesco Pham francesco.pham@huawei.com