From: @zhangbuxue
Reviewed-by: 
Signed-off-by:

Authors: John Tzanakakis, Adel Shafiei, Amir Lashkari, Islam Amin

1. add ExecNode and StreamRxecOrderRecorer
2. add json format and json dump for stream exec order
3. add stream exec order api
4. add in CMakeLists

1. add validation for directory and filename
2. refactor the file operations about path
3. add in CMakeLists
4. add logger in nn_ops

1. add string recorder
2. record somas
3. remove SomasInfoRecorder
4. fix clang and cpplint

1. add env_config_path for ms_context
2. add EnvConfigParser to parse config
3. add in CMakeLists
4. clang-format, cpplint
5. fix spelling in ms_context

Use EnvConfigParser in the constructed function of base_recorder,
when a recorder is initialized, its direcctory will be set as the
value from config file. In addition, recorder_manager will get the
'enable' from config file. If 'enable' is true and the path is not a
valid value, it will be the default value: './rdr'.

Additonal Authors: Adel Shafiei, Harshvardhan Gupta

Signed-off-by: leonwanghui <leon.wanghui@huawei.com>