test/cephadm: extend timeout limit to fix timeout issue

test/cephadm: extend timeout limit to fix timeout issue

When run make check(arm64) on omani series servers, eg.
https://jenkins.ceph.com/job/ceph-pull-requests-arm64/54751/.
Shows:
python: timeout after 30 seconds
INFO     root:call_wrappers.py:284 Non-zero exit code 124 from /home/jenkins-build/build/workspace/ceph-pull-requests-arm64/src/cephadm/.tox/py3/bin/python -c for i in range(1000000): print(i, flush=True)

Fixes: https://tracker.ceph.com/issues/65355
Signed-off-by: Rongqi Sun <sunrongqi@huawei.com>