Proxy policy route use the reserved table number

[LionelJouin]

Describe the bug
The proxy creates policy routes for each VIP address, so it creates a routing table with a new number for each of them.
https://github.com/Nordix/Meridio/blob/v1.0.5/pkg/proxy/proxy.go#L393
At some point, it will reach the reserved table number (corresponding to the default table), and internal traffic might break for that proxy.

To Reproduce
Add many 255 VIPs

Expected behavior
Jump over the reserved table number: http://linux-ip.net/html/routing-tables.html

Context

• Meridio: v1.0.5

Logs
From 63
https://jenkins.nordix.org/blue/organizations/jenkins/meridio-e2e-long-run-test-kind/detail/meridio-e2e-long-run-test-kind/14/pipeline
72.tar.gz