Description of problem:
When gsyncd failed with tracebacks during start, it prints
only exception object but not the error string. This patch
adds the error string as well.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
Example error message
"failed with ImportError"
"failed with ImportError: No module named _io."
REVIEW: https://review.gluster.org/23707 (geo-rep: Improve debugging) posted (#1) for review on master by Kotresh HR
REVIEW: https://review.gluster.org/23707 (geo-rep: Improve debugging) merged (#2) on master by Sunny Kumar