Exclude Azure´s AlwaysOn calls

**Is your feature request related to a problem?**
Using Azure´s "Always On" feature pings "/" every 5 minutes. This fills up my applications insights with messages that has no use to me. It also shows up in the application map, which then gives me a false number for the amount of requests.

This path cannot be excluded in the OPENCENSUS EXCLUDELIST_PATHS, is it is using a string.startswith() https://github.com/census-instrumentation/opencensus-python/blob/d63d295851e7361657d714c5cd0835e7cd7d0847/opencensus/trace/utils.py#L45-L70

**Describe the solution you'd like.**
I would like some sort of pattern to exclude the Azure AlwaysOn feature. Eg. ["!!AzureAlwaysOn"].

**Describe alternatives you've considered.**
I would be able to use [""] as a EXCLUDELIST_PATHS, but that would exclude everything.

**Additional context.**
Using Django.

The Azure AlwaysOn call example: http://localhost:8000/   eg. GET /


	def disable_tracing_url(url, excludelist_paths=None):
	"""Disable tracing on the provided excludelist paths, by default not tracing
	the health check request.

	If the url path starts with the excludelisted path, return True.

	:type excludelist_paths: list
	:param excludelist_paths: Paths that not tracing.

	:rtype: bool
	:returns: True if not tracing, False if tracing.
	"""
	if excludelist_paths is None:
	excludelist_paths = DEFAULT_EXCLUDELIST_PATHS

	# Remove the 'https?\|ftp://' if exists
	url = re.sub(URL_PATTERN, '', url)

	# Split the url by the first '/' and get the path part
	url_path = url.split('/', 1)[1]

	for path in excludelist_paths:
	if url_path.startswith(path):
	return True

	return False

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Exclude Azure´s AlwaysOn calls #1102

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Exclude Azure´s AlwaysOn calls #1102

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