Fix bugs found in integration test (#3214)

test/vso_tools/build_wheel.py

+from _common import build_wheel
+
+build_wheel()

test/vso_tools/generate_nni_version.py

+from datetime import datetime
+
+from _common import set_variable
+
+time = datetime.now().strftime('%Y%m%d%H%M%S')
+set_variable('NNI_RELEASE', '999.' + time)

test/vso_tools/install_nni.py

+import sys
+
+from _common import build_wheel, run_command
+
+if len(sys.argv) <= 2:
+    extra_dep = ''
+else:
+    extra_dep = f'[{sys.argv[2]}]'
+
+wheel = build_wheel()
+run_command(f'{sys.executable} -m pip install {wheel}{extra_dep}')

test/vso_tools/start_docker.py

+"""
+Build docker image, start container, then set its SSH service port to VSO variable "docker_port".
+
+Usage:
+    python start_docker.py <nni-version> <container-name> <password-in-docker>
+"""
+
+import random
+import socket
+import sys
+
+from _common import build_wheel, run_command, set_variable
+
+# find idle port
+port = random.randint(10000, 20000)
+while True:
+    sock = socket.socket()
+    if sock.connect_ex(('localhost', port)) != 0:
+        break  # failed to connect, so this is idle
+    sock.close()
+    port = random.randint(10000, 20000)
+
+version = sys.argv[1]
+container = sys.argv[2]
+password = sys.argv[3]
+
+run_command(f'docker build --build-arg NNI_RELEASE={version} -t nnidev/nni-nightly .')
+run_command(f'docker run -d -t -p {port}:22 --name {container} nnidev/nni-nightly')
+run_command(f'docker exec {container} useradd --create-home --password {password} nni')
+run_command(['docker', 'exec', container, 'bash', '-c', f'echo "nni:{password}" | chpasswd'])
+run_command(f'docker exec {container} service ssh start')
+set_variable('docker_port', port)

test/vso_tools/stop_docker.py

+import sys
+
+from _common import run_command
+
+name = sys.argv[1]
+run_command(f'docker container stop {name}')
+run_command(f'docker container rm {name}')