Install system-recovery binary for both gui & non-gui platforms

Install system-recovery binary for both gui & non-gui platforms

Following changes were applied:

 * system-recovery is build twice for gui & non-gui versions

 * recovery-init is same for both gui & non-gui

   It detects environment and exectues appropriate system-recovery binary.

 * needless %post/pre scripts were removed

   It should be enough to install differently named files directly from
   package.

 * additional code reorganization applied to source tree

   Needed to separate gui & non-gui variants.

Change-Id: I13302d0cb5f441ef2a28d040599823f1503f61e3