Created sensor cache class

Created sensor cache and sensor interface that needs to be
implemented by sensors.

Tested:
- Sensors created by sensor cache are stored and reused if
there is try to ac

Created sensor cache class

Created sensor cache and sensor interface that needs to be
implemented by sensors.

Tested:
- Sensors created by sensor cache are stored and reused if
there is try to access same sensor multiple times.
- All other units tests are passing

Change-Id: I552b2016bca4688e1b2a223297587826af256b54
Signed-off-by: Krzysztof Grobelny <krzysztof.grobelny@intel.com>

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