plugin-api: common: Add plugin-api-common

plugin-api: common: Add plugin-api-common

plugin-api was added to provide plugin feature.
Plugin separates target-specific code to plugin-backend
from common Tizen codes such as deviced or resourced.
The structure of plugin-api is based on the hal-api.

The files newly created during build due to this patch are as follows:
(arch=armv7l)

plugin-api-common-0.1.0-0.armv7l.rpm
 * /usr/lib/: libplugin-api-common.so.0 -> libplugin-api-common.so.0.1.0
 * /usr/lib/: libplugin-api-common.so.0.1.0
 * /usr/share/licenses/plugin-api-common: LICENSE.MIT

plugin-api-common-debuginfo-0.1.0-0.armv7l
 * /usr/lib/debug/usr/lib: libplugin-api-common.so.0.1.0.debug

libsyscommon-debugsource-5.0.0-0.armv7l.rpm
 * /usr/src/debug/libsyscommon-5.0.0-0.arm/src/plugin-api/common/include: plugin-common.h
 * /usr/src/debug/libsyscommon-5.0.0-0.arm/src/plugin-api/common/include: plugin-common-interface.h
 * /usr/src/debug/libsyscommon-5.0.0-0.arm/src/plugin-api/common/src: plugin-api-list.h
 * /usr/src/debug/libsyscommon-5.0.0-0.arm/src/plugin-api/common/src: plugin-api-conf.c
 * /usr/src/debug/libsyscommon-5.0.0-0.arm/src/plugin-api/common/src: plugin-api-conf.h
 * /usr/src/debug/libsyscommon-5.0.0-0.arm/src/plugin-api/common/src: common.h
 * /usr/src/debug/libsyscommon-5.0.0-0.arm/src/plugin-api/common/src: plugin-api-common.c

plugin-api-common-devel-0.1.0-0.armv7l
 * /usr/include/plugin: plugin-common.h
 * /usr/include/plugin: plugin-common-interface.h
 * /usr/lib/: libplugin-api-common.so -> libplugin-api-common.so.0
 * /usr/lib/pkgconfig/plugin-api-common.pc
 * /usr/share/licenses/plugin-api-common: LICENSE.MIT

Change-Id: I3c0b385d7bd76b82db8db73beb189b78009b8774
Signed-off-by: SangYoun Kwak <sy.kwak@samsung.com>