Bump yangtools to 2.0.20 98/82098/5
authorRobert Varga <robert.varga@pantheon.tech>
Wed, 15 May 2019 13:16:15 +0000 (15:16 +0200)
committerRobert Varga <robert.varga@pantheon.tech>
Thu, 23 May 2019 11:50:26 +0000 (13:50 +0200)
This brings in latest fixes and fixes test models to coply with
RFC6020.

Change-Id: If92adc72e25ee1187707c6e9e3d7b4a57721f105
Signed-off-by: Robert Varga <robert.varga@pantheon.tech>

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