Fix bug in get-next: test start-oid/end-oid separately #20
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We had a case where
oid: '1.3.6.1.2.1.4.24.4.1'
endoid: '1.3.6.1.2.1.5'
When checking against '1.3.6.1.2.1.4.20.1.1.32.4.1.2', which is below the start-oid's range (note the 20 < 24), it still evaluate as success, making the get-next give a OID that is lesser than the input oid.
The bug seems to be case where the endoid was shorter and this raises a IndexError making the test for (start)oid useless. So, i have separated the tests for soid and eoid. Please consider this change and merge.