Resolving issues preventing connection with areaDetector device

[jwlodek]

The PV name is DataType_RBV and not NDDataType_RBV - causes connection error when connecting to AD device.

[jwlodek]

Also, added second commit that removes erroneous enum option. With it included we cannot connect to an AD device:

NotConnected:                                                         
manta_async: NotConnected:                                            
    drv: NotConnected:                                                
        data_type: TypeError: XF:31ID1-ES{GigE-Cam:1}cam1:DataType_RBV
 has choices ('Int8', 'UInt8', 'Int16', 'UInt16', 'Int32', 'UInt32', '
Int64', 'UInt64', 'Float32', 'Float64'), which do not match <enum 'ADB
aseDataType'>, which has ('Int8', 'UInt8', 'Int16', 'UInt16', 'Int32',
 'UInt32', 'Int64', 'UInt64', 'Float32', 'Float64', 'DOUBLE').        
    hdf: NotConnected:                                                
        data_type: TypeError: XF:31ID1-ES{GigE-Cam:1}HDF1:DataType_RBV
 has choices ('Int8', 'UInt8', 'Int16', 'UInt16', 'Int32', 'UInt32', '
Int64', 'UInt64', 'Float32', 'Float64'), which do not match <enum 'ADB
aseDataType'>, which has ('Int8', 'UInt8', 'Int16', 'UInt16', 'Int32',
 'UInt32', 'Int64', 'UInt64', 'Float32', 'Float64', 'DOUBLE').        
                                                                      

[jwlodek]

Third issue was found that wasn't caught in tests was that the dir path needs to be cast to a string from a PathLib PosixPath.