modified detection

• 501772tenable_ot_rockwell_CVE-2018-0172.nasl • 1.5
• 501768tenable_ot_rockwell_CVE-2018-0173.nasl • 1.5
• 501769tenable_ot_rockwell_CVE-2018-0167.nasl • 1.5
• 501770tenable_ot_rockwell_CVE-2018-0175.nasl • 1.5
• 501773tenable_ot_rockwell_CVE-2018-0174.nasl • 1.5
• 500101tenable_ot_siemens_CVE-2016-7114.nasl • 1.9
• 500947tenable_ot_abb_CVE-2019-7225.nasl • 1.6