Add missing support for handling extra configuration file for GTM proxies in pgxc_ctl
Add missing support for handling extra configuration file for GTM proxies in
pgxc_ctl

yazun/postgres-xl,yazun/postgres-xl,oberstet/postgres-xl,ovr/postgres-xl,zeroae/postgres-xl,zeroae/postgres-xl,yazun/postgres-xl,techdragon/Postgres-XL,techdragon/Postgres-XL,techdragon/Postgres-XL,pavanvd/postgres-xl,Postgres-XL/Postgres-XL,ovr/postgres-xl,pavanvd/postgres-xl,zeroae/postgres-xl,oberstet/postgres-xl,Postgres-XL/Postgres-XL,oberstet/postgres-xl,ovr/postgres-xl,Postgres-XL/Postgres-XL,pavanvd/postgres-xl,oberstet/postgres-xl,zeroae/postgres-xl,techdragon/Postgres-XL,pavanvd/postgres-xl,ovr/postgres-xl,yazun/postgres-xl,zeroae/postgres-xl,oberstet/postgres-xl,Postgres-XL/Postgres-XL,techdragon/Postgres-XL,pavanvd/postgres-xl,Postgres-XL/Postgres-XL,ovr/postgres-xl,yazun/postgres-xl