CBQE-1263: support local+remote site ddoc creation

This change allows representing ddoc creation as a list in test spec.
This is useful for including local/remote definitions in same phase.
i.e..
"0":
{
    "name" : "create_design_docs",
    "desc" :  "create_design_docs",
    "ddocs" : [{"create" :
        [{"ddoc":"ddoc1",
        "view":"local_default_view1",
        "map":"function(doc){emit(doc.key,doc.key_num);}",
        "bucket":"default"},

        {"ddoc":"ddoc2",
        "view":"local_sasl_view1",
        "map":"function(doc){emit(doc.key,doc.key_num);}",
        "bucket":"saslbucket"}]},

        {"remote" : "10.0.0.5",
        "create" :
        [{"ddoc":"ddoc1",
            "view":"remote_default_view1",
            "map":"function(doc){emit(doc.key,doc.key_num);}",
            "bucket":"default"},
        {"ddoc":"ddoc2",
        "view":"remote_sasl_view1",
        "map":"function(doc){emit(doc.key,doc.key_num);}",
        "bucket":"saslbucket"}]}],

        "runtime" : 10 }
    }
}

Change-Id: Ifd2c3dea7c0442cc22b7b109049e371cd1b49106
Reviewed-on: http://review.couchbase.org/26071
Reviewed-by: Chisheng Hong <chisheng@couchbase.com>
Tested-by: Tommie McAfee <tommie@couchbase.com>