DELIA-65803, RDKTV-32272

DELIA-65803 - Async retry logic to check netsrvmgr is active

Reason for change: Added asynchronous retry logic with thread to check the
availability of netsrvmgr in network manager plugin
Test Procedure: Check the status of network manager plugin is activated in
wpeframework
Risks: Low
Priority: P1
Signed-off-by: Gururaaja ESR <Gururaja_ErodeSriranganRamlingham@comcast.com>

RDKTV-32272 - Wi-Fi Connection in Network page is showing 2.4Ghz when connected to 5Ghz network

Reason for change: The value 2 showed in the frequency is enum value of 5GHz. Changed the code to return the proper frequency value in MHz.
Test Procedure: Check with curl commands
Risks: Low
Priority: P1
Change-Id: I4c85ff58cbad46bd5e890c29542e4451af58d2fa
Signed-off-by: Gururaaja ESR <Gururaja_ErodeSriranganRamlingham@comcast.com>