Oliver L

Support setting cloud role name via envvar

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# What we are trying to address The changes in this PR allows devs to configure the logged cloud role name (in AppInsights) using an environment variable (APPLICATIONINSIGHTS_ROLE_NAME) - if...

Allow to configure the cloud role parameter

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It is unclear how to set the cloud role value for a log record. According to https://github.com/census-instrumentation/opencensus-python/blob/5ad2a7cc62fc9663d186e15636a7b0306c9a8d7a/contrib/opencensus-ext-azure/opencensus/ext/azure/common/utils.py#L27 the cloud is always `'ai.cloud.role': os.path.basename(sys.argv[0]) or 'Python Application'` This is a problem...