Close client session in every cases

For instance, when aborting a certification:

Do you confirm sending this certification? [y/N]: n
Aborted!
ERROR:asyncio:Unclosed client session
client_session: <aiohttp.client.ClientSession object at 0x7f02f5594348>
ERROR:asyncio:Unclosed connector
connections: ['[(<aiohttp.client_proto.ResponseHandler object at 0x7f02effd5dc8>, 7239440.848067479)]']
connector: <aiohttp.connector.TCPConnector object at 0x7f02f55a16d8>

cert
tx: When aborting a transaction.
#321 (closed): Use with x as y:?

Edited Jun 02, 2020 by Moul

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