[LU-213] using direct io for quota test to avoid cache problem

• Type: Bug
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.1.0
• Affects Version/s: Lustre 2.0.0
• Severity: 3
• Bugzilla ID: 23,430
• Assignee: Hongchao Zhang
• Reporter: Hongchao Zhang

Description

in test_14a of sanity_quota, the data written was cached in client side, which cause the test failed.
using "multiop ${TESTFILE} oO_DIRECT" (direct IO) instead of "dd" to avoid such issue