* Make disjoint mode working when service node up (inittime=1), and in the time not run in parallel to avoid access DB too much
* For shared tftp, nothing need to be done in AAsn
- URL for kernel/initrd, get the value from below value tftpserver -> xcatmaster -> myipfn
- URL for image, get the value from below value nfsserver -> tftpserver -> xcatmaster -> myipfn
2, handle 'disjoint' in preprocess method, to make sure that no request will be sent to SN which does not manage the nodes.
3, refine 'stat' to make sure it could query unmanaged nodes on-demand.
* Fix#3087: nodeset improvement - using multi-process to parallelize
- before deliver the request to xcatd, we can split the request to multiple sub-requests which contains different noderange
- in that, xcatd could hanle those sub-requests in parallel, just like some issue multiple commands.
* refine according to the review comments:
- not using POSIX::ceil
- Callback is reserved for filter method
* refine codes according review comments
* make the comments right and more readable.
* Fix issue #2794, Nodeset fails to generate /tftpboot config files if ip attribute is not set
- Report error when the node cannot be handled by its xcatmaster/servicenode (sharedtftp=0)
* - using determinehostname to get the current server name, it will reduce the time when many service nodes.
With the nytprof tool, the buttleneck is the time to update the bootparams
table.To optimize the performance on large scale nodes, this patch tranfer
the bootparams hash through variable reference.
posible impact: getdestiny can not get the information about bootparams.
partial-issue: #2024
