getting corrupted snapshot_info_t

Updated test to use snapshot markers and seeing open_snapshot fail due to some bad seqnums being returned from fdb_get_all_snap_markers

marker[0]

(lldb) print markers[0]
(fdb_snapshot_info_t) $1 =

{ marker = 6856901536 num_kvs_markers = 0 kvs_markers = 0x00007fff5fbfee10 }

(lldb) print markers[0].kvs_markers[0]
(fdb_kvs_commit_marker_t) $16 = (kv_store_name = "", seqnum = 1688849860263936)
(lldb) print markers[0].kvs_markers[1]
(fdb_kvs_commit_marker_t) $17 = (kv_store_name = "\x90", seqnum = 4294996056)

Notice it's only issue with compaction...happens in 2nd iteration of test here:
http://review.couchbase.org/#/c/48867/1