PWX-36850: reduce verbosity of frequent ops by making those Debug

[pnookala-px]

PWX-36850
Reduce log message level from Into to Debug to avoid log flooding.

[dtalreja-px]

LGTM

[lpabon]

I can confirm that the test TestAlertsServerEnumerate also fails in master:

[nix-shell:~/git/golang/openstorage/api/server/sdk]$ git checkout master
Switched to branch 'master'
Your branch is up to date with 'origin/master'.

[nix-shell:~/git/golang/openstorage/api/server/sdk]$ go test -v
=== RUN   TestAlertsServerEnumerate
    sdk_test.go:170: 
        	Error Trace:	/home/lpabon/git/golang/openstorage/api/server/sdk/sdk_test.go:170
        	            				/home/lpabon/git/golang/openstorage/api/server/sdk/alerts_test.go:319
        	Error:      	Expected nil, but got: &errors.errorString{s:"Failed to connect gRPC server localhost:30549: context deadline exceeded"}
        	Test:       	TestAlertsServerEnumerate
--- FAIL: TestAlertsServerEnumerate (60.04s)
panic: runtime error: invalid memory address or nil pointer dereference
	panic: runtime error: invalid memory address or nil pointer dereference [recovered]
	panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x10 pc=0x93377a]

goroutine 86 [running]:
testing.tRunner.func1.2({0x176cf40, 0x2ba2590})
	/home/lpabon/apps/go/src/testing/testing.go:1631 +0x24a
testing.tRunner.func1()
	/home/lpabon/apps/go/src/testing/testing.go:1634 +0x377
panic({0x176cf40?, 0x2ba2590?})
	/home/lpabon/apps/go/src/runtime/panic.go:770 +0x132
google.golang.org/grpc.(*ClientConn).Close(0x0)
	/home/lpabon/git/golang/openstorage/vendor/google.golang.org/grpc/clientconn.go:972 +0x3a
github.com/libopenstorage/openstorage/api/server/sdk.(*testServer).Stop(0xc00018e9c0)
	/home/lpabon/git/golang/openstorage/api/server/sdk/sdk_test.go:297 +0x48
panic({0x176cf40?, 0x2ba2590?})
	/home/lpabon/apps/go/src/runtime/panic.go:770 +0x132
google.golang.org/grpc.(*ClientConn).NewStream(0x17374c0?, {0x1eaee00?, 0x2c45180?}, 0x0?, {0x1a0710b?, 0xc000f88360?}, {0x0?, 0xc000f83de8?, 0x41156a?})
	/home/lpabon/git/golang/openstorage/vendor/google.golang.org/grpc/stream.go:144 +0x32
github.com/libopenstorage/openstorage/api.(*openStorageAlertsClient).EnumerateWithFilters(0xc0004ff760?, {0x1eaee00?, 0x2c45180?}, 0x2bbdf40, {0x0?, 0x1f8b5e2?, 0xf?})
	/home/lpabon/git/golang/openstorage/api/api.pb.go:45062 +0x67
github.com/libopenstorage/openstorage/api/server/sdk.TestAlertsServerEnumerate(0xc00001e340)
	/home/lpabon/git/golang/openstorage/api/server/sdk/alerts_test.go:337 +0x27e
testing.tRunner(0xc00001e340, 0x1a90ff0)
	/home/lpabon/apps/go/src/testing/testing.go:1689 +0xfb
created by testing.(*T).Run in goroutine 1
	/home/lpabon/apps/go/src/testing/testing.go:1742 +0x390
exit status 2
FAIL	github.com/libopenstorage/openstorage/api/server/sdk	60.060s

[lpabon]

Confirmed that in release-9.8 branch it also fails with the same error