Fix sl6 deployment

Some components still don't use fairtest release:

lxpub03:~ > source /cvmfs/nica.jinr.ru/sl6/fairtest/AIO_export.sh
lxpub03:~ > . /cvmfs/nica.jinr.ru/sl6/mpdroot/dev/mpdroot_config.sh
System during compilation: Scientific Linux release 6.10 (Carbon)
                           x86_64
System now               : Scientific Linux release 6.10 (Carbon)
                           x86_64
lxpub03:~ > root
*** DISPLAY not set, setting it to ak025.jinr.ru:0.0
PopupLogo, XOpenDisplay failed
Fatal in <TROOT::InitInterpreter>: cannot load library /cvmfs/nica.jinr.ru/sl6/fairsoft/jun19p1/lib/root/libThread.so.6.16: undefined symbol: __cxa_throw_bad_array_new_length

Most likely its due to source geant4.sh in SetEnv.sh is executed before source /cvmfs/nica.jinr.ru/sl6/fairtest/AIO_export.sh