add start_postgres function and stop_function to REL_11_STABLE and REL_10_STABLE.
PG12 and later versions added start_postgres and stop_postgres functions.
PG11 and earlier versions did not add these two functions, which caused regression test failures.
The reason for not adding them in pre-PG11 versions is that
The PR that added the start_postgres and stop_postgres functions is modifications related to postgresql.conf
add start_postgres function and stop_function to REL_11_STABLE and REL_10_STABLE. PG12 and later versions added start_postgres and stop_postgres functions. PG11 and earlier versions did not add these two functions, which caused regression test failures.
The reason for not adding them in pre-PG11 versions is that The PR that added the start_postgres and stop_postgres functions is modifications related to postgresql.conf