Make ACA validation code not use telem for AACCCDPT start

The code here was cheating and using telemetry for the initial value of the `aacccdpt` node:
```
In [1]: run -i validate_aca_temps.py --mpdir /data/mpcrit1/mplogs/2013/MAY0613/ofls
Fetching msid: aacccdpt over 2013:122:10:08:40.816 to 2013:125:10:51:04.816
Fetching msid: aosares1 over 2013:122:10:08:40.816 to 2013:125:10:51:04.816
Fetching msid: aoeclips over 2013:122:10:08:40.816 to 2013:125:10:51:04.816
Fetching msid: aacccdpt over 2013:125:10:07:20.816 to 2013:132:10:35:12.816   <<======
Fetching msid: aosares1 over 2013:125:10:07:20.816 to 2013:132:10:35:12.816
Fetching msid: aoeclips over 2013:125:10:07:20.816 to 2013:132:10:35:12.816
```