skip call to get metadata search keys for a bucket

[adrdc]

there is an issue when getting metadatasearch keys for a bucket. it causes the presto server to fail to load.
this is traced down to a jaxb dependency issue.

presto query utilizing metadatasearch is currently disabled so these things are not utilized anyway.

for now, we will skip the error by removing the call to get metadatasearch keys for a bucket.
the dependency issue can be revisited when metadatasearch is fully implemented. please see
#57