bug: assets project gps_uart_spec.xml OCS includes Signal attribute
rx and tx signals do not belong in component spec. This was possibly introducing during: #362 (closed)
<ComponentSpec>
<property name='nmea_in' type='char' volatile='true'/>
<property name='nmea_out' type='char' writable='true'/>
<property name='byte_count' type='ulong' volatile='true'/>
<Signal Input='rx'/>
<Signal Output='tx'/>
</ComponentSpec>
ocpidev should be smart enough to warn, or perhaps even error, about this.