[SysApps][Tizen] Fixed the incorrect event type and rename the event type

1. remove 'on' before the event type
     such as: onattach -> attach
2. rename event type to keep consistent with spec
     such as: rename 'attach' -> 'storageattach'

spec: http://device-capabilities.sysapps.org/
Merge pull request #1287 from qjia7/master

[SysApps][Tizen] Fixed the incorrect event type and rename the event type