feat: Avoid redundant trials

[gaocegege]

The new_trials looks like this. Thus we should not use the first item all the times.

[
    {'state': 0, 'tid': 2, 'spec': None, 'result': {'status': 'new'
        }, 'misc': {'tid': 2, 'cmd': ('domain_attachment', 'FMinIter_Domain'), 'workdir': None, 'idxs': {'param-1': [
                    2
                ], 'param-2': [
                    2
                ], 'param-3': [
                    2
                ], 'param-4': [
                    2
                ]
            }, 'vals': {'param-1': [
                    2
                ], 'param-2': [
                    0
                ], 'param-3': [
                    2
                ], 'param-4': [
                    1.496156082719898
                ]
            }
        }, 'exp_key': None, 'owner': None, 'version': 0, 'book_time': None, 'refresh_time': None
    },
    {'state': 0, 'tid': 3, 'spec': None, 'result': {'status': 'new'
        }, 'misc': {'tid': 3, 'cmd': ('domain_attachment', 'FMinIter_Domain'), 'workdir': None, 'idxs': {'param-1': [
                    3
                ], 'param-2': [
                    3
                ], 'param-3': [
                    3
                ], 'param-4': [
                    3
                ]
            }, 'vals': {'param-1': [
                    0
                ], 'param-2': [
                    1
                ], 'param-3': [
                    0
                ], 'param-4': [
                    2.8898132037592097
                ]
            }
        }, 'exp_key': None, 'owner': None, 'version': 0, 'book_time': None, 'refresh_time': None
    }
]

Signed-off-by: Ce Gao gaoce@caicloud.io

[tobegit3hub]

Nice catch. Thanks for your contribution @gaocegege 😃