added override control of eos in internal jtimon configs

[amohit1315]

Related Issue(s): #38

Added config for enabling/disabling eos for internal jtimon configs.
This configuration overrides the eos value set outside the internal-jtimon config section

Example:

"internal-jtimon": {
    "data-log-file": "TelemetrySensorData.log",
    "gnmi-eos": true,
    "pre-gnmi-eos": true
}

If eos is not set within internal-jtimon, then it takes the value of eos from parent config