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.
- categorize into topics without "xCAT" in the heading
since the topics are all related to xCAT
- Alphabetize the topics to make it easier to find
- create sub directories for the topics to contain
the documentation
- broke down some of the docs to multiple files to help
ease of readability
