[LU-12714] PCC Phase 2 - Whamcloud Community JIRA

This ticket will capture the next set of feature work around PCC (added in ~~LU-10092~~). More details will be captured here soon.

is related to

LU-13924 Document PCC "lfs pcc add" options

Progress

1.	Auto attach for PCC during IO	Resolved	Qian Yingjin
2.	detach and delete the PCC cached files when remove a PCC backend from a client	Open	Qian Yingjin
3.	Remove the RW-PCC copy using HSM RAoLU	Open	Qian Yingjin
4.	Separate the naming structure between RW-PCC and RO-PCC	Open	Qian Yingjin
5.	Readonly Persistent Client Cache support	Reopened	Qian Yingjin
6.	Configurable rule based auto PCC caching for newly created files	Resolved	Qian Yingjin
7.	Add statistics for RW-PCC and RO-PCC	Open	Qian Yingjin
8.	Add lfs pcc_dev commond when add/del PCC backend	Open	Qian Yingjin
9.	Add lctl cleanup\|uncache\|revalidate commands for PCC	Open	Qian Yingjin
10.	Remove the stale PCC copy when the file was modified in Lustre after data restore	Open	Qian Yingjin
11.	Update the data version in HSM attrs after data restore	Open	Qian Yingjin
12.	PCC: Invalidate PCC-RO cache when access from the old client	Open	Qian Yingjin