modified detection

• 502004tenable_ot_mikrotik_CVE-2015-2350.nasl • 1.2
• 500141tenable_ot_siemens_CVE-2015-5386.nasl • 1.7
• 501475tenable_ot_moxa_CVE-2015-6464.nasl • 1.4
• 501477tenable_ot_moxa_CVE-2015-6465.nasl • 1.4
• 501466tenable_ot_moxa_CVE-2015-6466.nasl • 1.4
• 500043tenable_ot_rockwell_CVE-2015-6488.nasl • 1.8
• 500134tenable_ot_rockwell_CVE-2015-6490.nasl • 1.8
• 500038tenable_ot_rockwell_CVE-2015-6486.nasl • 1.8
• 500152tenable_ot_rockwell_CVE-2015-6491.nasl • 1.8
• 500089tenable_ot_rockwell_CVE-2015-6492.nasl • 1.8
• 501480tenable_ot_moxa_CVE-2016-0875.nasl • 1.3
• 500238tenable_ot_siemens_CVE-2016-2846.nasl • 1.6
• 501510tenable_ot_moxa_CVE-2016-0878.nasl • 1.3
• 501532tenable_ot_moxa_CVE-2016-0877.nasl • 1.3