By Jethro Nededog LOS ANGELES (TheWrap.com) – Appropriately, MTV waited until after Labor Day to announce the premiere dates for two new workplace reality series. “Big Tips Texas,” which follows a group of friends working at a Dallas bar, premieres with back-to-back episodes starting Wednesday, October 9 at 10/9c. And “Scrubbing in,” which follows the travails of nine nurses relocated to an Orange County, Calif. hospital, premieres Thursday, October 24 at 10/9c. MTV is beefing up both its unscripted and scripted slates. …