Use canonical imports (#822)

* fix: challenge are not required for revoke.

challenge/challenges.go

@@ -1,4 +1,4 @@
-package challenge
+package challenge // import "github.com/xenolf/lego/challenge"
 
 import (
 	"fmt"

challenge/dns01/cname.go

@@ -1,4 +1,4 @@
-package dns01
+package dns01 // import "github.com/xenolf/lego/challenge/dns01"
 
 import "github.com/miekg/dns"
 

challenge/dns01/dns_challenge.go

@@ -1,4 +1,4 @@
-package dns01
+package dns01 // import "github.com/xenolf/lego/challenge/dns01"
 
 import (
 	"crypto/sha256"

challenge/dns01/dns_challenge_manual.go

@@ -1,4 +1,4 @@
-package dns01
+package dns01 // import "github.com/xenolf/lego/challenge/dns01"
 
 import (
 	"bufio"

challenge/dns01/dns_challenge_manual_test.go

@@ -1,4 +1,4 @@
-package dns01
+package dns01 // import "github.com/xenolf/lego/challenge/dns01"
 
 import (
 	"io"

challenge/dns01/dns_challenge_test.go

@@ -1,4 +1,4 @@
-package dns01
+package dns01 // import "github.com/xenolf/lego/challenge/dns01"
 
 import (
 	"crypto/rand"

challenge/dns01/fqdn.go

@@ -1,4 +1,4 @@
-package dns01
+package dns01 // import "github.com/xenolf/lego/challenge/dns01"
 
 // ToFqdn converts the name into a fqdn appending a trailing dot.
 func ToFqdn(name string) string {

challenge/dns01/fqdn_test.go

@@ -1,4 +1,4 @@
-package dns01
+package dns01 // import "github.com/xenolf/lego/challenge/dns01"
 
 import (
 	"testing"

challenge/dns01/nameserver.go

@@ -1,4 +1,4 @@
-package dns01
+package dns01 // import "github.com/xenolf/lego/challenge/dns01"
 
 import (
 	"fmt"

challenge/dns01/nameserver_test.go

@@ -1,4 +1,4 @@
-package dns01
+package dns01 // import "github.com/xenolf/lego/challenge/dns01"
 
 import (
 	"sort"

challenge/dns01/precheck.go

@@ -1,4 +1,4 @@
-package dns01
+package dns01 // import "github.com/xenolf/lego/challenge/dns01"
 
 import (
 	"errors"

challenge/dns01/precheck_test.go

@@ -1,4 +1,4 @@
-package dns01
+package dns01 // import "github.com/xenolf/lego/challenge/dns01"
 
 import (
 	"testing"

challenge/http01/http_challenge.go

@@ -1,4 +1,4 @@
-package http01
+package http01 // import "github.com/xenolf/lego/challenge/http01"
 
 import (
 	"fmt"

challenge/http01/http_challenge_server.go

@@ -1,4 +1,4 @@
-package http01
+package http01 // import "github.com/xenolf/lego/challenge/http01"
 
 import (
 	"fmt"

challenge/http01/http_challenge_test.go

@@ -1,4 +1,4 @@
-package http01
+package http01 // import "github.com/xenolf/lego/challenge/http01"
 
 import (
 	"crypto/rand"

challenge/provider.go

@@ -1,4 +1,4 @@
-package challenge
+package challenge // import "github.com/xenolf/lego/challenge"
 
 import "time"
 

challenge/resolver/errors.go

@@ -1,4 +1,4 @@
-package resolver
+package resolver // import "github.com/xenolf/lego/challenge/resolver"
 
 import (
 	"bytes"

challenge/resolver/prober.go

@@ -1,4 +1,4 @@
-package resolver
+package resolver // import "github.com/xenolf/lego/challenge/resolver"
 
 import (
 	"fmt"

challenge/resolver/prober_mock_test.go

@@ -1,4 +1,4 @@
-package resolver
+package resolver // import "github.com/xenolf/lego/challenge/resolver"
 
 import (
 	"time"

challenge/resolver/prober_test.go

@@ -1,4 +1,4 @@
-package resolver
+package resolver // import "github.com/xenolf/lego/challenge/resolver"
 
 import (
 	"errors"

challenge/resolver/solver_manager.go

@@ -1,4 +1,4 @@
-package resolver
+package resolver // import "github.com/xenolf/lego/challenge/resolver"
 
 import (
 	"context"

challenge/resolver/solver_manager_test.go

@@ -1,4 +1,4 @@
-package resolver
+package resolver // import "github.com/xenolf/lego/challenge/resolver"
 
 import (
 	"crypto/rand"

challenge/tlsalpn01/tls_alpn_challenge.go

@@ -1,4 +1,4 @@
-package tlsalpn01
+package tlsalpn01 // import "github.com/xenolf/lego/challenge/tlsalpn01"
 
 import (
 	"crypto/rsa"

challenge/tlsalpn01/tls_alpn_challenge_server.go

@@ -1,4 +1,4 @@
-package tlsalpn01
+package tlsalpn01 // import "github.com/xenolf/lego/challenge/tlsalpn01"
 
 import (
 	"crypto/tls"

challenge/tlsalpn01/tls_alpn_challenge_test.go

@@ -1,4 +1,4 @@
-package tlsalpn01
+package tlsalpn01 // import "github.com/xenolf/lego/challenge/tlsalpn01"
 
 import (
 	"crypto/rand"