message: Set tracking branch
diff: [submodule "contrib/poco"]
  path = contrib/poco
  url = https://github.com/ClickHouse-Extras/poco.git
  - branch = master
  + branch = clickhouse-odbc
  [submodule "contrib/ssl"]
  path = contrib/ssl
  url = https://github.com/ClickHouse-Extras/ssl.git
  