Moler

Improved
* Support for text files with content the same as errors from commands

Improved
* Iperf2: calculate summary report at each interval when server handles client running in --parallel mode

Improved
* Allow AdbRemote device to have expected_prompt generated from serial_number of Android device

Improved
* Add catching error to openssl_x509_text_in command
* New fail scenario for ssh
* Openssl cmd
* Store datetime when data was read on connection
* Set establish_connection to False
* Support initial_state for already created devices

Improved
* Classes Connection and ObservableConnection are deprecated now. Their original code has been moved into
AbstractMolerConnection and ThreadedMolerConnection. Change made for code clarity.

Fixed
* Iperf2 command fails on parsing when used `with -s -P 1` options (single run server).
* Log all state changes in devices.

Added
* New method of converting string to int for whole dict.

Improved
* Keep state in background does not block main flow
* data_received() of commands & events gets additional parameter: time when data was caught on connection
* Improvement parsing in command ls.
* Commands, events and callbacks data processing is done in separate thread to secure connection reads against blocking
them by commands/events/callbacks.