BUG-2370 Reset schema context on disconnect in nc

Change-Id: I64197fc4ec375a07b2f0ea1dfb1215c4e31e206c
Signed-off-by: Maros Marsalek <mmarsale@cisco.com>
(cherry picked from commit aa14e255d17b0869a1de096cb0048f3c857a4ab0)
Merge "BUG-2370 Reset schema context on disconnect in nc" into stable/helium