icetray-start has incorrect syntax

[dsschult]

from http://code.icecube.wisc.edu/projects/icecube/ticket/1862:

icetray-start requests to be executed using plain sh, but uses syntax which only exists in bash to define functions. This prevents it from running on systems (Ubuntu, FreeBSD) where /bin/sh is either really the Bourne shell or something closer to being conformant with the Bourne shell specification:

/cvmfs/icecube.opensciencegrid.org/py2-v2/icetray-start: 52: /cvmfs/icecube.opensciencegrid.org/py2-v2/icetray-start: Syntax error: "(" unexpected

It appears that the correct solution is to remove all uses of the non-existent function keyword.