fix: rename SpdkJSONRPC to Client

[glimchb]

blocked by opiproject/opi-spdk-bridge#713

Signed-off-by: Boris Glimcher [email protected]

[codecov]

Codecov Report

Merging #448 (7072917) into main (8021ef4) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #448   +/-   ##
=======================================
  Coverage   88.99%   88.99%           
=======================================
  Files           7        7           
  Lines         845      845           
=======================================
  Hits          752      752           
  Misses         66       66           
  Partials       27       27           

Files	Coverage Δ
pkg/frontend/nvme_controller.go	91.15% <100.00%> (ø)
pkg/frontend/nvme_namespace.go	88.62% <100.00%> (ø)
pkg/frontend/nvme_subsystem.go	92.93% <100.00%> (ø)