jjb: xci: xci-run-functest.sh: Ensure env vars are quoted during reload

jjb: xci: xci-run-functest.sh: Ensure env vars are quoted during reload

The output of the 'env' command does not use quotes when printing the
env variables so trying to source the xci.env file will lead to problems like
the following one:

/home/devuser/releng-xci/.cache/xci.env: line 17: PROFILEREAD: readonly variable
/home/devuser/releng-xci/.cache/xci.env: line 20: 50340: command not found
/home/devuser/releng-xci/.cache/xci.env: line 40: controller00: command not found
/home/devuser/releng-xci/.cache/xci.env: line 48: on: command not found
/home/devuser/releng-xci/.cache/xci.env: line 55: Francisco/O=IT/CN=xci.releng.opnfv.org: No such file or directory
/home/devuser/releng-xci/.cache/xci.env: line 75: a: command not found
/home/devuser/releng-xci/.cache/xci.env: line 88: -I: command not found
/home/devuser/releng-xci/.cache/xci.env: line 90: 50340: command not found
/home/devuser/releng-xci/.cache/xci.env: line 92: -e: command not found
/home/devuser/releng-xci/.cache/xci.env: line 95: fg: no job control
/home/devuser/releng-xci/.cache/xci.env: line 101: fg: no job control

As such, we need to ensure that variables are properly quoted when
exported.

Change-Id: Ie98d8c921bae849d6bffd3858f67708f417b1d0f
Signed-off-by: Markos Chandras <mchandras@suse.de>