* test ccache hit statistics, test=develop

* test ccache hit statistics, test=develop

* add cache hit statistics, test=develop

* fix no percent symbol erro on windows, test=develop

* remove switch, test=develop

* Compiling operator libraries with Unity Build on Windows CPU.

* Compiling operator libraries with Unity Build on Windows GPU, no_test, test=windows_ci

* Add option in windows ci script, no_test, test=windows_ci

* Optimize parallel compiling, test=develop

* remove limit of parallel compile and skip some ops in UB, test=develop

* remove changes of header file, test=develop

* remove changes of header file, test=develop

* fix test_eye_op unittest failed, test=develop

* Compiling operator libraries with Unity Build on Linux, test=develop

* set default WITH_UNITY_BUILD=OFF, test=develop

* Move unity build rules into a single file and add comment, test=develop

* optimize parallel compilation, test=develop

* fix undefined reference error on coverage ci, test=develop

* fix win ci failure, test=develop

* add ci test, test=develop

* open unittests on windows

* open GPU unittest on windows

* add unittest and check unittest for windows

* fix lstm OP compile error on windows

* open a part of GPU unittest for windows

* open a part of GPU unittest for windows

* add monitoring for executive ut at night

* fix some error for paddle_build.bat

* fix some error

* fix some error in windows

* fix some error on windows

* clear clcache cache file and reopen clcache, test=develop

* reopen clcache, test=develop

* fix judge bug of errorlevel

* fix some error

* fix optimizer init

* Enhance the detection of whether to keep the build directory

* Enhance the detection of whether to keep the build directory

* disable ut quickly

* fix some error

* fix some error

* install urllib2 package

* use requests package instead of urllib2

* fix error caused by windows regular parameter

* fix error on windows

* fix some error

* fix with format error

* show disable ut in log

* fix some error

* fix some error

* add the handling of error in executing get_quickly_disable_ut

* add pip new requirements to windows

* Increase the conditions that restrict system installation

* add unittest count of windows

* Reduce the number of retries

* add timeout unittests retry

* modifed parameter use

* add failed unittests retry on win system

* modified the value of retry times

* Modify data download function, and support unittests of inference APIs on windows, test=develop

* The import error compatible with py2 and py3, and fix unittests problems of inference APIs on Windows, test=develop

show unittest time even if unittest failed

* turn on WITH_INFERENCE_API_TEST

* Count the time and packet size on windows

* fix conflit

* fix conflit

* fix conflit

* fix date-time funciton