LU-18330 tests: add interop PCCRO check for sanity-pcc/test_35

LU-18330 tests: add interop PCCRO check for sanity-pcc/test_35

Add interop PCCRO connection flag check for sanity-pcc/
test_{35,36}.
Fix the interop sanity-pcc tests with b2_15.

Test-Parameters: trivial serverversion=2.15.5 testlist=sanity-pcc
Test-Parameters: trivial testlist=sanity-pcc env=ONLY=36b,ONLY_REPEAT=100
Signed-off-by: Qian Yingjin <qian@ddn.com>
Change-Id: I9174752bf123abf608a2d3e1f72650cf08e7146e
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/56675
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: James Simmons <jsimmons@infradead.org>
Reviewed-by: Oleg Drokin <green@whamcloud.com>