SEATTLE – The frustration was quite evident late Tuesday night inside the spiraling Astros’ clubhouse after Mariners journeyman Aaron Harang threw a two-hit shutout against them. The defensive performance was disheartening yet again, and the offense was practically non-existent. Amid the gloom of yet another six-game losing streak, however, Astros ace righthander Bud Norris stood apart as a reason for hope. Whether as an example for his younger teammates or as a testament of his value to teams looking to acquire him at the trade deadline, Norris was impressive through seven strong innings while battling an illness. “Bud Norris has been nails, outstanding the whole year,” Astros manager Bo Porter [...]