fix: respect SPANNER_EMULATOR_HOST env var when autoConfigEmulator=true#2730

olavloite merged 2 commits intomaingoogleapis/java-spanner:mainfrom

respect-emulator-host-env-var-with-auto-config-emulatorgoogleapis/java-spanner:respect-emulator-host-env-var-with-auto-config-emulatorCopy head branch name to clipboard