Fix for LP bug 1376306

- With this fix bulk loading salted tables and indexes now generates parallel
  plans. Both salted base tables and salted indexes were tested
- if attemp_esp_parallelism cqd is set to off an error is returned
- also removed unneeded variables from sqenvcom.sh

Change-Id: I2a85d902070a4f35e3fe54b426a4277afaa60399
Merge "Fix for LP bug 1376306"