cmake: Extract libraries' configuration to separate file

Extract code which checks for availability of different libraries
(eg. fuse) to a separate Libraries.cmake file.
Introduce crcutil library

This commits adds a possibility to use crcutil library in the LizardFS
code. This library is automatically downloaded when cmake is run.

Change-Id: I322d3d4a557504262bda908639c7d48aa8676fe0
common: Use crcutil for CRC calculation

This commit changes the implementation of the CRC algorithm to
the one provided by crcutil library. The new code is rougly 6
times faster than the previous implementation and should result
in a noticable decrease of CPU usage one some installations.

Change-Id: Ie3b7cc47ad509dd7e6cd6bff98b6c5c960e6b86e