transceiver: reroute uhd  messages to logging facility
transceiver: reroute uhd  messages to logging facility

Pipe the following uhd message types to standard warning
levels (INFO, WARN, ERROR) respectively. Ignore fastpath
logging messages and, instead, catch them from the
asynchronous device interface.

    enum type_t{
        status  = 's',
        warning = 'w',
        error   = 'e',
        fastpath= 'f'
    };

Signed-off-by: Thomas Tsou <ttsou@vt.edu>

git-svn-id: 504cad4147f1e500be0a169b9f46375eaf875953@2676 19bc5d8c-e614-43d4-8b26-e1612bc8e597

kkroo/osmo-trx,kkroo/osmo-trx,pothosware/osmo-trx,ttsou/osmo-trx,kkroo/osmo-trx,osmocom/osmo-trx,telenoobie/osmo-trx,osmocom/osmo-trx,osmocom/osmo-trx,ttsou/osmo-trx,osmocom/osmo-trx,telenoobie/osmo-trx,pothosware/osmo-trx,pothosware/osmo-trx,pothosware/osmo-trx,ttsou/osmo-trx,kkroo/osmo-trx,ttsou/osmo-trx,telenoobie/osmo-trx,telenoobie/osmo-trx