Remove Logs Router Provider

[ianre]

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Relates OR Closes #0000

Output from acceptance testing:

$ make testacc TESTARGS='-run=TestAccIbmLogsRouter'
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test $(go list ./... |grep -v 'vendor') -v -run=TestAccIbmLogsRouter -timeout 700m
?   	github.com/IBM-Cloud/terraform-provider-ibm	[no test files]
?   	github.com/IBM-Cloud/terraform-provider-ibm/ibm/acctest	[no test files]
?   	github.com/IBM-Cloud/terraform-provider-ibm/ibm/flex	[no test files]
?   	github.com/IBM-Cloud/terraform-provider-ibm/ibm/provider	[no test files]
testing: warning: no tests to run
PASS
ok  	github.com/IBM-Cloud/terraform-provider-ibm/ibm/conns	0.994s [no tests to run]
[WARN] Set the environment variable IBM_PROJECTS_CONFIG_APIKEY for testing IBM Projects Config resources, the tests will fail if this is not set
[WARN] Set the environment variable IBM_APPID_TENANT_ID for testing AppID resources, AppID tests will fail if this is not set
... Lots of other warning lines
[WARN] Set the environment variable IBM_CODE_ENGINE_TLS_KEY with a TLS key in base64 format
[WARN] Set the environment variable IBM_SATELLITE_SSH_PUB_KEY with a ssh public key or ibm_satellite_* tests may fail
testing: warning: no tests to run
PASS
ok  	github.com/IBM-Cloud/terraform-provider-ibm/ibm/service/vpc	2.068s [no tests to run]