datapath: Use macro for SNAT max port
datapath: Use macro for SNAT max port

Instead of using 65535, use NODEPORT_PORT_MAX_NAT (=65535) macro to
specify the highest value of the SNAT port range. Otherwise, if we
change NODEPORT_PORT_MAX_NAT, then the ranges for SNAT and rev-SNAT
will get out of sync.

Signed-off-by: Martynas Pumputis <6b0d31c0d563223024da45691584643ac78c96e8@lambda.lt>

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