EX-3409 revert: "pcc: add owner capacity check for open attach"

EX-3409 revert: "pcc: add owner capacity check for open attach"

This reverts commit 7cce3772e267afee328d63da9367875c63e6ad43,
since this prevented users with read permission on a file to
auto-attach or manually attach the file into the local cache.

Test-Parameters: trivial testlist=sanity-pcc
Signed-off-by: Andreas Dilger <adilger@whamcloud.com>
Change-Id: Ib562f2c62acf3ed564309fa8ae56ba21bd31577c
Reviewed-on: https://review.whamcloud.com/44816
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Yingjin Qian <qian@ddn.com>