[session] provide missing apis to Connection
From this point, Connection provides a superset of ClientConnection.
Related to #3837233.
\.svn
^build$
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\.pyc$
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\~$
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^doc/book/en/apidoc$
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.*/data/database/.*\.sqlite
.*/data/database/.*\.config
.*/data/database/tmpdb.*
.*/data/ldapdb/.*
^doc/html/
^doc/doctrees/
^doc/book/en/devweb/js_api/
data/pgdb/