Append default mask field if user has not provided one

[prsunny]

- What I did
If user configures IP (v4 or v6) address without a mask, append the default /32 or /128 mask

- How I did it

- How to verify it
Redis command

config interface ip add Vlan1000 2001::1
config interface ip add Vlan1000 1.1.1.3
127.0.0.1:6379[4]> KEYS *VLAN_INTERFACE*
1) "VLAN_INTERFACE|Vlan1000|2001::1/128"
2) "VLAN_INTERFACE|Vlan1000|1.1.1.3/32"

- Previous command output (if the output of a command-line utility has changed)

- New command output (if the output of a command-line utility has changed)

[pavel-shirshov]

As the comment