Refactoring of directory structure and CMake files

Refactoring of directory structure and CMake files

Directory structure inherited from security-server is confusing and doesn't
separate components that form the project.
New structure consists of the following directories:
* src/include - public security-manager interface
* src/dpl - sources and includes borrowed from wrt-commons dpl
* src/common - sources of libsecurity-manager-common library
* src/client - sources of libsecurity-manager-client library
* src/server - sources of security-manager binary
* pc - template of pkg-config file

Additionally common, client and server include files have been moved into
"include" subdirectory in each source dir.
CMake files are now more hierarchical, with separete file per component.
Previously not checked dependency on libcap is now checked in server CMake.
Library versioning is aligned with package versioning of security-manager.
Version of libsecurity-manager-common is better parametrized.

Change-Id: I8db728e53f912db2b15109f5502def7fc105f77f
Signed-off-by: Rafal Krypa <r.krypa@samsung.com>