RDKB-31924 : Re-use elxrretyt.swr
RDKB-31924 : Re-use elxrretyt.swr

Reason for change: To reduce the usage of CEDM.
Do not remove the GetConfigFile output for elxrretyt.swr
Call GetConfigFile only if elxrretyt.swr not exist.
Test Procedure: check the presence of usage.log
Risks: Low
Signed-off-by: c203d989c4d130492e23b1465d6807e69555f364@comcast.com
Change-Id: Ibacd5da956fd37ead1b43f8c12dc1f4092695c67

rdkcmf/rdkb-CcspWifiAgent,rdkcmf/rdkb-CcspWifiAgent,rdkcmf/rdkb-CcspWifiAgent