CA-101785: Check for "disable_pv_vnc" in other_config before setting
vncterm

Signed-off-by: Siddharth Vinothkumar <siddharth.vinothkumar@citrix.com>
Merge pull request #1147 from siddharthv/SCTX-1318

CA-101785: Check for "disable_pv_vnc" in other_config before setting vncterm