src: fix pkg bootstrap -y

Currently, this causes pkg to exit with the very unhelpful error message
"pkg: unknown command: bootstrap"

This used to have the same behavior as `pkg bootstrap`in older versions
of pkg prior to commit fb9b331.

This commit restores the old behavior of `pkg bootstrap -y` and does not
affect the behavior if `-f` is passed.

Sponsored by:	The FreeBSD Foundation
References:	ifreund/pkgbasify#6

src/main.c

@@ -736,7 +736,7 @@ main(int argc, char **argv)
 				break;
 			}
 		}
-		if (yes == 0 && force == 0) {
+		if (force == 0) {
 			printf("pkg(8) already installed, use -f to force.\n");
 			exit(EXIT_SUCCESS);
 		} else if (force == 1) {

tests/frontend/pkg.sh

@@ -7,7 +7,8 @@ tests_init \
 	pkg_config_defaults \
 	pkg_create_manifest_bad_syntax \
 	pkg_repo_load_order \
-	double_entry
+	double_entry \
+	bootstrap
 
 pkg_no_database_body() {
         atf_skip_on Linux Test fails on Linux
@@ -101,3 +102,9 @@ PKG_ENV : {
 EOF
 	atf_check -o ignore pkg -C ./pkg.conf -vv
 }
+
+bootstrap_body()
+{
+	atf_check -o ignore pkg bootstrap
+	atf_check -o ignore pkg bootstrap -y
+}