Add re-try for redfish GET request for targets

Changes:
    - This retries is added to improve the success rate
      for the GET request in case returns JSON errors
      for the following URI during operation
      /redfish/v1/Systems/ and /redfish/v1/Managers/

    - Added other places in code to handle exceptions.
    - Fix IPMI import paths in test suite

Tested:
   - Ran from sandbox.

Change-Id: Ie37dbdd9c7572e0003a56e65a7b5f0a4c3b26a1a
Signed-off-by: George Keishing <gkeishin@in.ibm.com>
diff --git a/ipmi/test_ipmi_sel.robot b/ipmi/test_ipmi_sel.robot
index 77a45b3..d1c6dc4 100644
--- a/ipmi/test_ipmi_sel.robot
+++ b/ipmi/test_ipmi_sel.robot
@@ -3,10 +3,10 @@
 Documentation    Module to test IPMI SEL functionality.
 Resource         ../lib/ipmi_client.robot
 Resource         ../lib/openbmc_ffdc.robot
-Resource         ../../../lib/logging_utils.robot
+Resource         ../lib/logging_utils.robot
 
 Library          ../lib/ipmi_utils.py
-Library          ../../../lib/logging_utils.py
+Library          ../lib/logging_utils.py
 
 Variables        ../data/ipmi_raw_cmd_table.py