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/apex_singleton.go b/apex/apex_singleton.go
index 00dd446..d46104e 100644
--- a/apex/apex_singleton.go
+++ b/apex/apex_singleton.go
@@ -64,12 +64,14 @@
 			if grep -v -h '^#' ${allowed_deps_list} | sort -u -f| diff -B -u - ${new_allowed_deps}; then
 			   touch ${out};
 			else
-				echo -e "\n******************************";
+				echo;
+				echo "******************************";
 				echo "ERROR: go/apex-allowed-deps-error contains more information";
 				echo "******************************";
 				echo "Detected changes to allowed dependencies in updatable modules.";
 				echo "To fix and update packages/modules/common/build/allowed_deps.txt, please run:";
-				echo -e "$$ (croot && packages/modules/common/build/update-apex-allowed-deps.sh)\n";
+				echo "$$ (croot && packages/modules/common/build/update-apex-allowed-deps.sh)";
+				echo;
 				echo "When submitting the generated CL, you must include the following information";
 				echo "in the commit message if you are adding a new dependency:";
 				echo "Apex-Size-Increase: Expected binary size increase for affected APEXes (or the size of the .jar / .so file of the new library)";
@@ -78,7 +80,8 @@
 				echo "Test-Info: What’s the testing strategy for the new dependency? Does it have its own tests, and are you adding integration tests? How/when are the tests run?";
 				echo "You do not need OWNERS approval to submit the change, but mainline-modularization@";
 				echo "will periodically review additions and may require changes.";
-				echo -e "******************************\n";
+				echo "******************************";
+				echo;
 				exit 1;
 			fi;
 		`,