Increase a copier+chroot test timeout

Warning: I don't know what I'm doing, I just don't care
to deal with this now.

Signed-off-by: Miloslav Trmač <mitr@redhat.com>

Makefile

@@ -192,7 +192,7 @@ tests/testreport/testreport: tests/testreport/testreport.go
 .PHONY: test-unit
 test-unit: tests/testreport/testreport
 	$(GO_TEST) -v -tags "$(STORAGETAGS) $(SECURITYTAGS)" -cover $(RACEFLAGS) $(shell $(GO) list ./... | grep -v vendor | grep -v tests | grep -v cmd | grep -v chroot | grep -v copier) -timeout 45m
-	$(GO_TEST) -v -tags "$(STORAGETAGS) $(SECURITYTAGS)"        $(RACEFLAGS) ./chroot ./copier -timeout 45m
+	$(GO_TEST) -v -tags "$(STORAGETAGS) $(SECURITYTAGS)"        $(RACEFLAGS) ./chroot ./copier -timeout 60m
 	tmp=$(shell mktemp -d) ; \
 	mkdir -p $$tmp/root $$tmp/runroot; \
 	$(GO_TEST) -v -tags "$(STORAGETAGS) $(SECURITYTAGS)" -cover $(RACEFLAGS) ./cmd/buildah -args --root $$tmp/root --runroot $$tmp/runroot --storage-driver vfs --signature-policy $(shell pwd)/tests/policy.json --registries-conf $(shell pwd)/tests/registries.conf