Combine StorageDirectories Steps

Combine StorageDirectories Steps

Combined step :
 - StepCreateStorageDirectories and StepCreatePerUserStorageDirectories
 - StepUpdateStorageDirectories and StepUpdatePerUserStorageDirectories
 - StepRecoverStorageDirectories and StepRecoverPerUserStorageDirectories

Related changes
    [app-installers] https://review.tizen.org/gerrit/#/c/platform/core/appfw/app-installers/+/206075/
    [tpk-backend] https://review.tizen.org/gerrit/#/c/platform/core/appfw/tpk-backend/+/206194/
    [wgt-backend] https://review.tizen.org/gerrit/#/c/platform/core/appfw/wgt-backend/+/206193/

Change-Id: I2a23cede0e634a844868c8910e2440c0f34fd552
Signed-off-by: Ilho Kim <ilho159.kim@samsung.com>