LU-14768 e2fsck: merge expand_eisize_map properly

LU-14768 e2fsck: merge expand_eisize_map properly

Min known min_extra_isize should be updated after
threads finish.

Original commit:
cb4f0f44 ("LU-8465 e2fsck: merge expand_eisize_map properly")

Add the missing commit back, in pass5 we won't pick up some of
the inodes marked in pass1 for eisize expanding.

This should be merged to
e47509eb ("e2fsck: add support for expanding the inode size")
in the next rebase.

Change-Id: Ie9703383821ecb11337630d74ffb0c7dcb2fcc1e
Signed-off-by: Wang Shilong <wshilong@ddn.com>
Signed-off-by: Li Dongyang <dongyangli@ddn.com>
Reviewed-on: https://review.whamcloud.com/44011
Reviewed-by: Wang Shilong <wshilong@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Tested-by: jenkins <devops@whamcloud.com>