[202205][route_check] fix IPv6 address handling #2799
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BACKPORT of #2722
What I did
In case user has configured an IPv6 address on an interface in CONFIG DB in non simplified form like 2000:31:0:0::1/64 it is present in a simplified form in ASIC_DB. This leads to route_check failure since it just compares strings.
How I did it
Convert prefix string using ip_network().
How to verify it
UT replicates the issue.
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)