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

.ci/Dockerfile

 FROM ubuntu:22.04
-RUN apt update && DEBIAN_FRONTEND=noninteractive apt -y install make cmake pkg-config libcoap3-dev build-essential gcovr libgtest-dev libglib2.0-dev
+COPY run.sh /etc/init/
+RUN apt update && DEBIAN_FRONTEND=noninteractive apt -y install make cmake pkg-config libcoap3-dev build-essential gcovr libgtest-dev dbus-x11 libglib2.0-dev
+RUN ["chmod", "+x", "/etc/init/run.sh"]
+ENTRYPOINT ["/etc/init/run.sh"]
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