500 Internal Error for GET, PUT, DELETE Backend for a non existing backend #932

[amitdn2005]

#932

What type of PR is this?

Uncomment only one /kind <> line, hit enter to put that in a new line, and remove leading whitespace from that line:

/kind new feature

/kind bug fix

/kind cleanup
/kind revert change
/kind design
/kind documentation
/kind enhancement

What this PR does / why we need it:
This will modify response of the GET Backend API with invalid ID, DELETE Backend API with invalid ID and UPDATE Backend API with invalid ID.
Now the response is 500. The modified response will be 404 with proper error message.

Error MSG : Invalid backend id:

Which issue(s) this PR fixes:

Fixes #932

Test Report Added?:

Uncomment only one /kind <> line, hit enter to put that in a new line, and remove leading whitespace from that line:

/kind TESTED

/kind NOT-TESTED

Test Report:

Get Invalid Backend

DELETE invalid backend

GET valid backend

DELETE valid backend

Create valid backend

Special notes for your reviewer:

[PravinRanjan10]

@kumarashit please review

[PravinRanjan10]

LGTM

[codecov]

Codecov Report

Merging #1343 (6ba4be9) into master (4285082) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1343   +/-   ##
=======================================
  Coverage   48.12%   48.12%           
=======================================
  Files          10       10           
  Lines        1571     1571           
=======================================
  Hits          756      756           
  Misses        756      756           
  Partials       59       59           

[PravinRanjan10]

@vineela1999 @rajat-soda plz review

[kumarashit]

LGTM

[PravinRanjan10]

LGTM