Add SNMP alerts page and test hooks

This page will be included in Configuration section of the primary
navigation. The user will be able to delete and add alert destination.

Change-Id: I396d19a54ea

Add SNMP alerts page and test hooks

This page will be included in Configuration section of the primary
navigation. The user will be able to delete and add alert destination.

Change-Id: I396d19a54ea11724f2c5aec67e20ba9abff947d3
Signed-off-by: Konstantin Aladyshev <aladyshev22@gmail.com>

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