distro/fedora: add dracut-config-generic to bootloader packages

Dracut is unfortunately very host-dependant by default. The package
dracut-config-generic forces it use a generic configuration instead of a
configuration generated from the host environment.

This change should make the image generation more reproducible. For example
it was not possible to boot ami images built on Travis on AWS prior this
commit.

Also, the tests were re-generated in this commit.

internal/distro/fedora30/distro.go

@@ -344,7 +344,6 @@ func New() *Fedora30 {
 			"libxcrypt-compat",
 			"initscripts",
 			"glibc-all-langpacks",
-			"dracut-config-generic",
 		},
 		excludedPackages: []string{
 			"dracut-config-rescue",
@@ -407,6 +406,7 @@ func New() *Fedora30 {
 		distro: &r,
 		name:   "x86_64",
 		bootloaderPackages: []string{
+			"dracut-config-generic",
 			"grub2-pc",
 		},
 		buildPackages: []string{

internal/distro/fedora31/distro.go

@@ -343,7 +343,6 @@ func New() *Fedora31 {
 			"libxcrypt-compat",
 			"initscripts",
 			"glibc-all-langpacks",
-			"dracut-config-generic",
 		},
 		excludedPackages: []string{
 			"dracut-config-rescue",
@@ -405,6 +404,7 @@ func New() *Fedora31 {
 		distro: &r,
 		name:   "x86_64",
 		bootloaderPackages: []string{
+			"dracut-config-generic",
 			"grub2-pc",
 		},
 		buildPackages: []string{

internal/distro/fedora32/distro.go

@@ -344,7 +344,6 @@ func New() *Fedora32 {
 			"libxcrypt-compat",
 			"initscripts",
 			"glibc-all-langpacks",
-			"dracut-config-generic",
 		},
 		excludedPackages: []string{
 			"dracut-config-rescue",
@@ -407,6 +406,7 @@ func New() *Fedora32 {
 		distro: &r,
 		name:   "x86_64",
 		bootloaderPackages: []string{
+			"dracut-config-generic",
 			"grub2-pc",
 		},
 		buildPackages: []string{