[Couch] Update init scripts to avoid setting build environment variables outside of the .env file

[unlikelyzero]

Summary

To maintain some semblance of sanity, we need to ensure we have a totally declarative build process. We need to remove any default runtime parameters from the couchdb scripting.

openmct/src/plugins/persistence/couch/setup-couchdb.sh

Lines 4 to 13 in ccf7ed9

	check_env_var() {
	if [ -z "$1" ]; then
	echo "$2 has no value" 1>&2
	exit 1
	fi
	}
	check_env_var "${OPENMCT_DATABASE_NAME}" "OPENMCT_DATABASE_NAME"
	check_env_var "${COUCH_ADMIN_USER}" "COUCH_ADMIN_USER"
	check_env_var "${COUCH_BASE_LOCAL}" "COUCH_BASE_LOCAL"