Log Message:
Changes 5.2.2:

Bug fixes
1000: fixed some setup.py warnings.
1002: [SunOS] remove C macro which will not be available on new Solaris \ 
versions. (patch by Danek Duvall)
1004: [Linux] Process.io_counters() may raise ValueError.
1006: [Linux] cpu_freq() may return None on some Linux versions does not support \ 
the function; now the function is not declared instead.
1009: [Linux] sensors_temperatures() may raise OSError.
1010: [Linux] virtual_memory() may raise ValueError on Ubuntu 14.04.