Rename package, include and function name of system plugin

Rename package, include and function name of system plugin

Since the name of plugin has changed to syscommon-plugin/system-plugin,
the package name, include path and function name of plugin should be
changed.
 * in .spec file and CMakeLists.txt, package names are renamed:
      plugin-api-resourced -> libsyscommon-plugin-api-resourced
 * include path:
      plugin/plugin-resourced... -> syscommon-plugin-resourced...
      (The 'system' directory was included by the package config(.pc)
       file of plugins)
 * function name:
      plugin_resourced_memory_lmk_get_kill_candidates
      -> syscommon_plugin_resourced_memory_lmk_get_kill_candidates

Change-Id: Ie3b07e06e4d43536ac5ba2d92a2ef7ed2c1926b7
Signed-off-by: SangYoun Kwak <sy.kwak@samsung.com>