Moved the capturePktsBeforeTraffic & added deviation for isisLevelEnabled.

[priyaranjannanda]

Changes for

• Adding deviation isisLevelEnabled. for Juniper
• Moved capturePktsBeforeTraffic before interfaces are down.

[OpenConfigBot]

Pull Request Functional Test Report for #3550 / ce13098

Virtual Devices

Device	Test	Test Documentation	Job	Raw Log
Arista cEOS		RT-5.7: Aggregate Not Viable All
Cisco 8000E		RT-5.7: Aggregate Not Viable All
Cisco XRd		RT-5.7: Aggregate Not Viable All
Juniper ncPTX		RT-5.7: Aggregate Not Viable All
Nokia SR Linux		RT-5.7: Aggregate Not Viable All
Openconfig Lemming		RT-5.7: Aggregate Not Viable All

Hardware Devices

Device	Test	Test Documentation	Raw Log
Arista 7808		RT-5.7: Aggregate Not Viable All
Cisco 8808		RT-5.7: Aggregate Not Viable All
Juniper PTX10008		RT-5.7: Aggregate Not Viable All
Nokia 7250 IXR-10e		RT-5.7: Aggregate Not Viable All

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