net: add rte prefix to ip defines

net: add rte prefix to ip defines

Add 'RTE_' prefix to defines:
- rename IPv4( as RTE_IPv4(.
- rename IPV4_MAX_PKT_LEN as RTE_IPV4_MAX_PKT_LEN.
- rename IPV4_HDR_IHL_MASK as RTE_IPV4_HDR_IHL_MASK.
- rename IPV4_IHL_MULTIPLIER as RTE_IPV4_IHL_MULTIPLIER.
- rename IPV4_HDR_DF_SHIFT as RTE_IPV4_HDR_DF_SHIFT.
- rename IPV4_HDR_MF_SHIFT as RTE_IPV4_HDR_MF_SHIFT.
- rename IPV4_HDR_FO_SHIFT as RTE_IPV4_HDR_FO_SHIFT.
- rename IPV4_HDR_DF_FLAG as RTE_IPV4_HDR_DF_FLAG.
- rename IPV4_HDR_MF_FLAG as RTE_IPV4_HDR_MF_FLAG.
- rename IPV4_HDR_OFFSET_MASK as RTE_IPV4_HDR_OFFSET_MASK.
- rename IPV4_HDR_OFFSET_UNITS as RTE_IPV4_HDR_OFFSET_UNITS.
- rename IPV4_ANY as RTE_IPV4_ANY.
- rename IPV4_LOOPBACK as RTE_IPV4_LOOPBACK.
- rename IPV4_BROADCAST as RTE_IPV4_BROADCAST.
- rename IPV4_ALLHOSTS_GROUP as RTE_IPV4_ALLHOSTS_GROUP.
- rename IPV4_ALLRTRS_GROUP as RTE_IPV4_ALLRTRS_GROUP.
- rename IPV4_MAX_LOCAL_GROUP as RTE_IPV4_MAX_LOCAL_GROUP.
- rename IPV4_MIN_MCAST as RTE_IPV4_MIN_MCAST.
- rename IPV4_MAX_MCAST as RTE_IPV4_MAX_MCAST.
- rename IS_IPV4_MCAST as RTE_IS_IPV4_MCAST.
- rename IPV6_HDR_FL_SHIFT as RTE_IPV6_HDR_FL_SHIFT.
- rename IPV6_HDR_TC_SHIFT as RTE_IPV6_HDR_TC_SHIFT.
- rename IPV6_HDR_FL_MASK as RTE_IPV6_HDR_FL_MASK.
- rename IPV6_HDR_TC_MASK as RTE_IPV6_HDR_TC_MASK.

Signed-off-by: Olivier Matz <olivier.matz@6wind.com>