Feature/nat 996 dsc0

assigned to @Aleksandr.Kurbatov

added 6 commits

• 04b1192a...94d36509 - 3 commits from branch develop
• 89daeff9 - Add static dsc.0 interface config in IES template
• 8ed3b5de - Add static IGMP config
• 8e2e509c - Add dsc.0 to PIM

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