Currently the getadapter implementation store the nics information
in multiple files. This implementaion will store the records in the
database and add the following changes:
1. Add taskstate table to record the getadapter request.
2. Add route_request hook in xcatd to avoid of too much process.
3. Add adapterinfo column to keep the adapter information.
4. Use fifo pipe to send/recv the adapter message and wake up the waiting process.
5. Use alarm signal to handle the timeout event.
Currently abort failure(0x81) occur during the initiate stage as
the firmware state is not stable enough after cold reset. As the
delay time is not a constant value, this change add a interface in
site table for user to set this value.
Close-issue: #471
