testing: add a project-wide toml config file for revive

Revive is a tool similar to golint but can be configured. Add an initial
configuration for revive.
This configuration reduces the initial issue list to something more
manageable and that can be worked on incrementally rather than trying to
boil to ocean to make the checker happy.

Signed-off-by: John Mulligan <jmulligan@redhat.com>

.revive.toml

@@ -0,0 +1,33 @@
+
+ignoreGeneratedHeader = false
+severity = "warning"
+confidence = 0.8
+errorCode = 1
+warningCode = 0
+
+[directive.specify-disable-reason]
+
+[rule.blank-imports]
+[rule.context-as-argument]
+[rule.context-keys-type]
+[rule.dot-imports]
+[rule.error-return]
+[rule.error-strings]
+[rule.error-naming]
+#[rule.exported]
+[rule.if-return]
+[rule.increment-decrement]
+#[rule.var-naming]
+[rule.var-declaration]
+[rule.package-comments]
+[rule.range]
+[rule.receiver-naming]
+[rule.time-naming]
+[rule.unexported-return]
+#[rule.indent-error-flow]
+[rule.errorf]
+[rule.empty-block]
+[rule.superfluous-else]
+[rule.unused-parameter]
+[rule.unreachable-code]
+[rule.redefines-builtin-id]