Don't use echo -e

A rule that uses echo -e may execute in a dash shell instead of bash
when running on the build servers.  The dash echo builtin is posix
compliant, and does not treat -e as an option[1].  Replace all uses
of echo -e with echo if it does not need escape sequences, or printf
if it does.

[1] https://wiki.ubuntu.com/DashAsBinSh#echo

Bug: 378931009
Test: manual
Change-Id: I2974f59ea10a613bc3bd36e3591fd81f38a1769a
diff --git a/apex/builder.go b/apex/builder.go
index b04a9d7..ca1e66d 100644
--- a/apex/builder.go
+++ b/apex/builder.go
@@ -196,7 +196,7 @@
 		Command: `diff --unchanged-group-format='' \` +
 			`--changed-group-format='%<' \` +
 			`${image_content_file} ${allowed_files_file} || (` +
-			`echo -e "New unexpected files were added to ${apex_module_name}." ` +
+			`echo "New unexpected files were added to ${apex_module_name}." ` +
 			` "To fix the build run following command:" && ` +
 			`echo "system/apex/tools/update_allowed_list.sh ${allowed_files_file} ${image_content_file}" && ` +
 			`exit 1); touch ${out}`,