fix the NRI_PLUGIN_NAME env value when launching a pre-installed plugin

[Iceber]

The environment variable NRI_PLUGIN_NAME actually represents name in the plugin

nri/pkg/stub/stub.go

Lines 273 to 280 in 8329599

	func New(p interface{}, opts ...Option) (Stub, error) {
	stub := &stub{
	plugin: p,
	name: os.Getenv(api.PluginNameEnvVar),
	idx: os.Getenv(api.PluginIdxEnvVar),
	socketPath: api.DefaultSocketPath,
	dialer: func(p string) (stdnet.Conn, error) { return stdnet.Dial("unix", p) },
	doneC: make(chan struct{}),

nri/pkg/stub/stub.go

Lines 450 to 452 in 8329599

	func (stub *stub) Name() string {
	return stub.idx + "-" + stub.name
	}

so if we pass plugin name(< idx >-< base name >), the log will print out 'plugin name' with duplicate idx.

time="2023-05-18T13:39:43+08:00" level=info msg="Subscribing plugin 03-03-logger (03-logger) for events RunPodSandbox,StopPodSandbox,RemovePodSandbox,CreateContainer,PostCreateContainer,StartContainer,PostStartContainer,UpdateContainer,PostUpdateContainer,StopContainer,RemoveContainer"
time="2023-05-18T13:39:43+08:00" level=info msg="Started plugin 03-03-logger..."

Note that there are some differences between the plugin name variable/field in plugin and adaptation.

adaptation	plugin
base name	stub.name
idx	stub.idx
plugin name(idx + "-" name)	stub.Name() -> stub.idx + "-" + stub.name

[Iceber]

/cc @klihub PTAL, Thanks

[codecov-commenter]

Codecov Report

Patch coverage has no change and project coverage change: +0.50 🎉

Comparison is base (2a8b655) 63.83% compared to head (ed9096d) 64.33%.

❗ Current head ed9096d differs from pull request most recent head 4a4cea6. Consider uploading reports for the commit 4a4cea6 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #42      +/-   ##
==========================================
+ Coverage   63.83%   64.33%   +0.50%     
==========================================
  Files           9        9              
  Lines        1800     1800              
==========================================
+ Hits         1149     1158       +9     
+ Misses        500      492       -8     
+ Partials      151      150       -1     

Impacted Files	Coverage Δ
pkg/adaptation/plugin.go	48.59% <0.00%> (ø)

... and 1 file with indirect coverage changes

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[klihub]

LGTM.

[mikebrow]

/LGTM