ver: make --quiet output suitable for scripting/piping

Do not print version numbers or compare result char when in quiet
mode. This makes the output suitable for be used in scripts or pipes.

For example:

  # Upgrade all packages that matches a given regexp
  apk version --limit '<' --quiet | grep $regexp | apk fix --reinstall

  # Delete all packages that are removed from repository
  apk version --limit '?' --quiet | xargs apk del

1 files changed, 4 insertions, 0 deletions

diff --git a/src/ver.c b/src/ver.c
index 90b6cd6..05ffce9 100644
--- a/src/ver.c
+++ b/src/ver.c
@@ -130,6 +130,10 @@ static void ver_print_package_status(struct ver_ctx *ictx, struct apk_database *
 	opstr = apk_version_op_string(r);
 	if ((ictx->limchars != NULL) && (strchr(ictx->limchars, *opstr) == NULL))
 		return;
+	if (apk_verbosity <= 0) {
+		printf("%s\n", pkg->name->name);
+		return;
+	}
 	snprintf(pkgname, sizeof(pkgname), PKG_VER_FMT,
 		 PKG_VER_PRINTF(pkg));
 	printf("%-40s%s " BLOB_FMT, pkgname, opstr, BLOB_PRINTF(*latest));