T5223: Fix removing key id for GRE tunnel

Fix for removing key id from GRE tunnel

Before fix:
del interfaces tunnel tun10 parameters ip key
commit
sudo ip tunnel show tun10
tun10: gre/ip remote 203.0.113.254 local 192.168.122.11 ttl 64 tos inherit key 1234

After the fix:
sudo ip tunnel show tun10
tun10: gre/ip remote 203.0.113.254 local 192.168.122.11 ttl 64 tos inherit