Path increasement in get_object

[k82cn]

Motivation

Currently, the flamepy will get whole data and patches if the version mismatch. This feature is to improve it by only get the delta patches based on version.

Function Specification

No api changes, only perf improvement in some cases.

Solutions

For cache server, it the version mistach, it's better to return the detal of patches instead of the whole data + patches.

Additional context

N/A

[k82cn]

fixed by #446