API_HOST should be manipulated as an URL and not as a string

[octplane]

This creates errors when changing the host to something with a trailing /

datadogpy/datadog/api/api_client.py

Line 121 in 7fb486f

url = "{api_host}/api/{api_version}/{path}".format(

[dabcoder]

Example if api_host is set to api.datadoghq.com/, it will result in a double //: api.datadoghq.com//api/....