[db-api/configuration] simplify db-api and configuration so that all the connection information is in the repository url, closes #2521848 eg no more specific option of pyro ns host, group, etc. This also fixes broken ZMQ sources. Changes: * dropped pyro-ns-host, pyro-instance-id, pyro-ns-group from client side config, in favor of repository-uri. No migration done, supposing there is **no web-only config** in the wild. Also stop discovering the connection method through the repo_method class attribute of the configuration, varying according to the configuration class. This is a first step on the way to a simpler configuration handling. Notice those pyro options are still available for repository only / all-in-one configurations as they are needed to configure the pyro server. * stop telling connection method using ConnectionProperties, this is so boring. Also, drop _cnxtype from Connection and cnxtype from Session. The former is replaced by a is_repo_in_memory property and the later is totaly useless. * deprecate in_memory_cnx which becomes useless, use _repo_connect instead

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# some entities have been added before schema entities, fix the 'is' and

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# 'is_instance_of' relations

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for rtype in ('is', 'is_instance_of'):

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    sql('INSERT INTO %s_relation '

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        'SELECT X.eid, ET.cw_eid FROM entities as X, cw_CWEType as ET '

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        'WHERE X.type=ET.cw_name AND NOT EXISTS('

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        '      SELECT 1 from is_relation '

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        '      WHERE eid_from=X.eid AND eid_to=ET.cw_eid)' % rtype)