Normalize the default configuration discovery paths for all three config files, and update documentation and tests accordingly

internal/config/campaign_config_test.go

@@ -9,7 +9,6 @@ import (
 
 func TestCampaignConfigDefaultSearchOrder(t *testing.T) {
 	want := []string{
-		"./campaign.yml",
 		"/usr/local/etc/narratio/campaign.yml",
 		"/etc/narratio/campaign.yml",
 	}

internal/config/defaults.go

@@ -1,14 +1,12 @@
 package config
 
-// Default filesystem locations for pipeline configuration lookup when --config
-// is omitted. Order is highest to lowest precedence.
+// Default filesystem locations for config lookup when config path flags are
+// omitted. Order is highest to lowest precedence.
 const (
 	DefaultPipelineConfigPathUsrLocal = "/usr/local/etc/narratio/pipeline.yml"
 	DefaultPipelineConfigPathEtc      = "/etc/narratio/pipeline.yml"
-	DefaultCampaignConfigPathLocal    = "./campaign.yml"
 	DefaultCampaignConfigPathUsrLocal = "/usr/local/etc/narratio/campaign.yml"
 	DefaultCampaignConfigPathEtc      = "/etc/narratio/campaign.yml"
-	DefaultSessionConfigPathLocal     = "./session.yml"
 	DefaultSessionConfigPathUsrLocal  = "/usr/local/etc/narratio/session.yml"
 	DefaultSessionConfigPathEtc       = "/etc/narratio/session.yml"
 	DefaultS3AccessKeyIDEnv           = "OBJECT_STORAGE_KEY_ID"
@@ -97,7 +95,6 @@ var DefaultPipelineConfigSearchPaths = []string{
 // Keep this in a variable so future defaults can be extended without changing
 // call sites.
 var DefaultCampaignConfigSearchPaths = []string{
-	DefaultCampaignConfigPathLocal,
 	DefaultCampaignConfigPathUsrLocal,
 	DefaultCampaignConfigPathEtc,
 }
@@ -108,7 +105,6 @@ var DefaultCampaignConfigSearchPaths = []string{
 // Keep this in a variable so future defaults can be extended without changing
 // call sites.
 var DefaultSessionConfigSearchPaths = []string{
-	DefaultSessionConfigPathLocal,
 	DefaultSessionConfigPathUsrLocal,
 	DefaultSessionConfigPathEtc,
 }