2ndQuadrant/pglogical REL2_3

Version 2.3.4 is security release fixing CVE-2021-3515.

Changes

Fix pg_dump/pg_restore execution (CVE-2021-3515)
Correctly escape the connection string for both pg_dump and pg_restore so that exotic database and user names are handled
correctly.
Reported by Pedro Gallegos
Assign collation to the index scan key
When doing lookups for INSERT/UPDATE/DELETE, either to find conflicts or key for the operation to be applied, we should use correct collation.
This fixes issues with PostgreSQL 12+ primary key lookups when primary key is on column using one of the textual types.
Execute pg_ctl with appropriate verbosity in pglogical_create_subscriber
When -v is passed to pglogical_create_subscriber, it will now call pg_ctl without silent mode. This is useful for troubleshooting.
Clarify documentation regarding REPLICA IDENTITY requirements and support