privval: add `SignerDialerEndpointRetryWaitInterval` option (#4115)

Added a small function to be able to change the default retry interval for the privval. The default is 100ms, this function allows to change to any time.Duration.

Co-Authored-By: Anton Kaliaev <anton.kalyaev@gmail.com>

CHANGELOG_PENDING.md

@@ -28,6 +28,7 @@ program](https://hackerone.com/tendermint).
 - [libs/pubsub] [\#4070](https://github.com/tendermint/tendermint/pull/4070) Strip out non-numeric characters when attempting to match numeric values.
 - [p2p] [\#3991](https://github.com/tendermint/tendermint/issues/3991) Log "has been established or dialed" as debug log instead of Error for connected peers (@whunmr)
 - [rpc] [\#4077](https://github.com/tendermint/tendermint/pull/4077) Added support for `EXISTS` clause to the Websocket query interface. 
+- [privval] Add `SignerDialerEndpointRetryWaitInterval` option (@cosmostuba)
 
 ### BUG FIXES:
 

privval/signer_dialer_endpoint.go

@@ -26,6 +26,11 @@ func SignerDialerEndpointConnRetries(retries int) SignerServiceEndpointOption {
 	return func(ss *SignerDialerEndpoint) { ss.maxConnRetries = retries }
 }
 
+// SignerDialerEndpointRetryWaitInterval sets the retry wait interval to a custom value
+func SignerDialerEndpointRetryWaitInterval(interval time.Duration) SignerServiceEndpointOption {
+	return func(ss *SignerDialerEndpoint) { ss.retryWait = interval }
+}
+
 // SignerDialerEndpoint dials using its dialer and responds to any
 // signature requests using its privVal.
 type SignerDialerEndpoint struct {