MB-66959 Fix invocation of fetching collections manifest

Get collections manifest request validates that the vbid given is 0.
But the cb_evict_key program is meant to specify some vbucket and hence it fails:

./cb_evict_key.py Administrator password default 100 colA_-5835 _default.FunctionCollection1
mc_bin_client.ErrorEinval: Memcached error #4:  EINVAL : Invalid packet : {"error":{"context":"Request vbucket id must be 0"}}

The fix is same as what we do for get_collection_id.

Post fixing:
./cb_evict_key.py Administrator password default 100 colA_-5835 _default.FunctionCollection1
(211893125, 0, b'Ejected.')

Change-Id: Ic35e6e03c6bd47b37c2e5c3a91165fd1395973f1
Reviewed-on: https://review.couchbase.org/c/kv_engine/+/230628
Reviewed-by: Mohammad Zaeem <[email protected]>
Tested-by: Build Bot <[email protected]>

Author: rohansuri

engines/ep/management/mc_bin_client.py

@@ -1058,11 +1058,14 @@ def set_collections(self, manifest):
         self._update_collection_map(manifest)
 
     def get_collections(self, update_map=False):
+        tmpVbucketId = self.vbucketId
+        self.vbucketId = 0
         rv = self._doCmd(memcacheConstants.CMD_COLLECTIONS_GET_MANIFEST,
                          '',
                          '')
         if update_map:
             self._update_collection_map(rv[2])
+        self.vbucketId = tmpVbucketId
         return rv
 
     def get_collection_id(self, path):