REORG: spoe: move spoe_encode_varint / spoe_decode_varint from spoe to common

These encoding functions does general stuff and can be used in
other context than spoe. This patch moves the function spoe_encode_varint
and spoe_decode_varint from spoe to common. It also remove the prefix spoe.

These functions will be used for encoding values in new binary sample fetch.
4 files changed