impl: let manifest file specify --enable-network for mock

For bazel, we need to fetch resources from the network. After some
fixes, we'll be fetching them from artifactory, at least.

This requires configuring "enable-network" for the mock call.

impl/mock.go

@@ -243,6 +243,9 @@ func (bldr *mockBuilder) runFedoraMockStages() error {
 	if bldr.noCheck {
 		buildArgs = append(buildArgs, "--nocheck")
 	}
+	if bldr.enableNetwork {
+		buildArgs = append(buildArgs, "--enable-network")
+	}
 	bldr.log("starting")
 	if err := bldr.runMockCmd(buildArgs); err != nil {
 		return err
@@ -403,6 +406,7 @@ func Mock(repo string, pkg string, arch string, extraArgs MockExtraCmdlineArgs)
 				dnfConfig:         dnfConfig,
 				errPrefix:         errPrefix,
 				dependencyList:    dependencyList,
+				enableNetwork:     pkgSpec.Build.EnableNetwork,
 			},
 			onlyCreateCfg: extraArgs.OnlyCreateCfg,
 			noCheck:       extraArgs.NoCheck,

impl/mock_cfg.go

@@ -36,6 +36,7 @@ type builderCommon struct {
 	dnfConfig         *dnfconfig.DnfConfig
 	errPrefix         util.ErrPrefix
 	dependencyList    []string
+	enableNetwork     bool
 }
 
 type mockCfgBuilder struct {

manifest/manifest.go

@@ -89,10 +89,11 @@ type Generator struct {
 // Generator specifies commands for eext generator
 // Refer to Generator struct denifition above.
 type Build struct {
-	Include      []string            `yaml:"include"`
-	RepoBundle   []RepoBundle        `yaml:"repo-bundle"`
-	Dependencies map[string][]string `yaml:"dependencies"`
-	Generator    Generator           `yaml:"eextgen"`
+	Include       []string            `yaml:"include"`
+	RepoBundle    []RepoBundle        `yaml:"repo-bundle"`
+	Dependencies  map[string][]string `yaml:"dependencies"`
+	Generator     Generator           `yaml:"eextgen"`
+	EnableNetwork bool                `yaml:"enable-network"`
 }
 
 // DetachedSignature spec