Update snmp.py

Change for SNMPv3 to work correctly
Addded 'additiona CIs' field
Importing CIs from a new plugin
Additional CIs are presented on JIRA Changes
Removed unnecessary assertion
Added some comment
Fixed bug with service lookup
Merge pull request #871 from quamilek/develop

Bumped bob-ajax-selects, django-bob version
Merge pull request #870 from zefciu/RALPH-1664

Fixed bug with service lookup
Merge pull request #866 from zefciu/CHMITO-174

Implementation for multiple CIs
Revert for pr #860 ("URLs containing networks with slashes...").
Merge pull request #872 from xor-xor/revert_1636

Revert for pr #860 ("URLs containing networks with slashes...").
Documentation for scan provided.
Merge pull request #873 from quamilek/develop

Update Django version to 1.4.13
Update scan.rst
Fixed Review
Update scan.rst
Migrations ordered
Merge pull request #875 from zefciu/migration-merge

Migrations ordered
Merge pull request #874 from vi4m/docs_fixes

Documentation for scan provided.