WIP: replace aiohttp.ClientSession with AlloyDBAdminAsyncClient

[rhatgadkar-goog]

No description provided.

[rhatgadkar-goog]

Getting the following error if using session.install("-e", "."):

ImportError while loading conftest '/usr/local/google/home/rhatgadkar/alloydb-python-connector/tests/unit/conftest.py'.
tests/unit/conftest.py:22: in <module>
    from mocks import FakeAlloyDBClient
tests/unit/mocks.py:33: in <module>
    from google.cloud.alloydb.connector.connection_info import ConnectionInfo
E   ModuleNotFoundError: No module named 'google.cloud.alloydb.connector'

Maybe there’s a conflict with the google-cloud-alloydb-connector package when installing the google-cloud-alloydb package. But when changing to session.install("."), this error doesn’t occur anymore.

[rhatgadkar-goog]

When trying to connect to an instance using this PR’s change, am getting the following error:

google.api_core.exceptions.RetryError: Timeout of 60.0s exceeded, last exception: 503 DNS resolution failed for https://alloydb.googleapis.com: C-ares status is not ARES_SUCCESS qtype=A name=https
 is_balancer=0: Domain name not found

Followed the work-around in telepresenceio/telepresence#1871 to use "native" GRPC DNS resolver, but still getting similar error:

google.api_core.exceptions.RetryError: Timeout of 60.0s exceeded, last exception: 503 DNS resolution failed for https://alloydb.googleapis.com: UNKNOWN: getaddrinfo("https://alloydb.googleapis.com"): Servname not supported for ai_socktype (-8)

Need to figure out how to resolve this error. Maybe it's related to the options we're passing when constructing AlloyDBAdminAsyncClient.

[rhatgadkar-goog]

When trying to connect to an instance using this PR’s change, am getting the following error:

google.api_core.exceptions.RetryError: Timeout of 60.0s exceeded, last exception: 503 DNS resolution failed for https://alloydb.googleapis.com: C-ares status is not ARES_SUCCESS qtype=A name=https
 is_balancer=0: Domain name not found

Followed the work-around in telepresenceio/telepresence#1871 to use "native" GRPC DNS resolver, but still getting similar error:

google.api_core.exceptions.RetryError: Timeout of 60.0s exceeded, last exception: 503 DNS resolution failed for https://alloydb.googleapis.com: UNKNOWN: getaddrinfo("https://alloydb.googleapis.com"): Servname not supported for ai_socktype (-8)

Need to figure out how to resolve this error. Maybe it's related to the options we're passing when constructing AlloyDBAdminAsyncClient.

Issue is now fixed in latest commit. When passing in the API endpoint in the ClientOptions object, the "https://" prefix needs to be removed.