Fixed :HTML5 streaming video is stuck during playing

Fixed :HTML5 streaming video is stuck during playing

[Title] HTML5 streaming video is stuck during playing
[Issue#] TD-6970
[Problem] When user tries to bigger than 130MB html5 video under WebKit based html5 video with http,
	the playback would be stuck.
[Cause] The unlimited local cache policy be enabled in 'queue2' with HTTP connection.
	So once the media source bigger than ("130MB" /tmpfs free spaces)from http,
	the cache will overflow and playback will stuck.
[Solution] The previous behavior is un-limited, so enable default 2MB limition tmpfs cache in queue2.
	This updates will not impact the manual media-pipeline setup, because the pipeline owner could
	set any propriety as before.
[Developer] Qing.Zhang (qing.zhang@intel.com)

Change-Id: If04acfae9beb42681cf7378006339cfb11137606