lib: remove the vrf_is_mapped_on_netns() function

Now that all daemons receive the VRF backend from zebra, we can get
rid of vrf_is_mapped_on_netns() in favor of using the more convenient
vrf_is_backend_netns() function, which doesn't require any argument.

This commit also fixes the following problem:
  debian(config)# ip route 50.0.0.0/8 blackhole vrf FAKE table 2
  % table param only available when running on netns-based vrfs

Even when zebra was started with the --vrfwnetns, the error
above would be displayed since the VRF FAKE didn't exist, which
would make vrf_is_mapped_on_netns() return 0 incorrectly. Using
vrf_is_backend_netns() this problem doesn't happen anymore.

Signed-off-by: Renato Westphal <renato@opensourcerouting.org>

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