BUF: Fix import patients scripts error on Python 2.6

by removing VistA.wait('') line as that does not work on
python 2.6.6, also remove VistA.wait('>') in signoff method of
PATActions.py.

OSEHRA-Id: http://issues.osehra.org/browse/OAT-77
Change-Id: Ibe50755fba3d593ba3720efbf31abdfe95011fae