[PATCH] pynfs: fix key error if FATTR4_OPEN_ARGUMENTS is not supported

[Chen Hanxiao <chenhx.fnst@xxxxxxxxxxx>]

If FATTR4_OPEN_ARGUMENTS is not supportd, DELEG24 and DELEG25
will throw:
	KeyError: 86

Check FATTR4_OPEN_ARGUMENTS in caps from server

Signed-off-by: Chen Hanxiao <chenhx.fnst@xxxxxxxxxxx>
---
 nfs4.1/server41tests/st_delegation.py | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/nfs4.1/server41tests/st_delegation.py b/nfs4.1/server41tests/st_delegation.py
index fa9b451..f27e852 100644
--- a/nfs4.1/server41tests/st_delegation.py
+++ b/nfs4.1/server41tests/st_delegation.py
@@ -311,6 +311,9 @@ def _testCbGetattr(t, env, change=0, size=0):
                 OPEN4_SHARE_ACCESS_WRITE |
                 OPEN4_SHARE_ACCESS_WANT_WRITE_DELEG)
 
+    if FATTR4_OPEN_ARGUMENTS not in caps:
+        fail("FATTR4_OPEN_ARGUMENTS not supported")
+
     if caps[FATTR4_SUPPORTED_ATTRS] & FATTR4_OPEN_ARGUMENTS:
         if caps[FATTR4_OPEN_ARGUMENTS].oa_share_access_want & OPEN_ARGS_SHARE_ACCESS_WANT_DELEG_TIMESTAMPS:
             openmask |= 1<<OPEN_ARGS_SHARE_ACCESS_WANT_DELEG_TIMESTAMPS
-- 
2.47.1