WebUI: Adding Filters support to system logs

Adding Filter support to system logs page
- Severity filter.
- Date filter with start and end date.
- Filter by Sensort Type.

WebUI: Adding Filters support to system logs

Adding Filter support to system logs page
- Severity filter.
- Date filter with start and end date.
- Filter by Sensort Type.

Tested By:
Loaded System logs page with type selection
'Event' and check all filters.

Change-Id: I41eba4cd59c0f3c2933637bf0e207a3eca3214f1
Signed-off-by: AppaRao Puli <apparao.puli@linux.intel.com>

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