sb2-monitor: bugfix: wrap user's versions of LD_PRELOAD and LD_LIBRARY_PATH
sb2-monitor: bugfix: wrap user's versions of LD_PRELOAD and LD_LIBRARY_PATH

- The bug: If "sb2-config" was used to set environment variables
  LD_PRELOAD and/or LD_LIBRARY_PATH, those user-provided values
  could conflict with the values needed by SB2 itself - and the
  result might be e.g. that SB2 won't work at all
- The fix: Prefix these two variables just as user's versions
  of those are wrapped inside the sessions. This is transparent
  to the user.

OlegGirko/ldbox,ldbox/ldbox,ldbox/ldbox,OlegGirko/ldbox,OlegGirko/ldbox,OlegGirko/ldbox,ldbox/ldbox,ldbox/ldbox,ldbox/ldbox,ldbox/ldbox,OlegGirko/ldbox,OlegGirko/ldbox