[SSM] Modify thread util and framework init method

[SSM] Modify thread util and framework init method

Problem: Thread worker crashes while terminating.
         SoftSensor searching path must given at compile time

How:     Rearchitecture threading model
         Add XML descriptor based framework initialization.
           1. Search SoftSensorDescription.xml
              (previously high-context.xml) where executable located
           2. Or put search path using below init configration.

<SSMCore>
    <Device>
        <UDN>abcde123-31f8-11b4-a222-08002b34c003</UDN>
        <Name>MyPC</Name>
        <Type>PC</Type>
    </Device>
    <Config>
        <SoftSensorRepository>/usr/local/SSRepo/</SoftSensorRepository>
        <SoftSensorDescription>/usr/local/SSRepo/SSDescription.xml</SoftSensorDescription>
    </Config>
</SSMCore>

Change-Id: Id2c0746357d9e850e9e90016547b116412b758d2
Signed-off-by: Kim Jee Hyeok <jihyeok13.kim@samsung.com>