[SysApps] Added a mock StorageInfoProvider

This is just a mock info provider emulating how a provider will behave in a real
life. When monitoring for file system events, it will add and remove a storage
every 1s. It will also report at least 3 non-removable storages when asked.

We could reuse this later for unit tests.
[SysApps] Do not build Device Capabilities for Tizen and Android

Otherwise it will clash with the new implementation.
[SysApps] Add a simple test for Device Capabilities

Not to self: make a browsertest out of this. :)