[NX-756] Show interface operational status in UI

http://www.netxms.org/forum/e-eoe-o-koaot-netxms/interface-status-down/

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**Migrated from track.radensolutions.com**

- **Original Issue:** NX-756
- **Type:** Feature
- **State:** Fixed
- **Priority:** Normal
- **Subsystem:** GUI (Java and Web)
- **Created:** 2015-11-06 12:57:48 UTC
- **Updated:** 2016-01-04 21:11:41 UTC
- **Reporter:** Victor Kirhenshtein (@2128506)
