fixup: ttcn3-tcpdump*.sh: Fix output of special chars

On ArchLinux /bin/sh is actually a symlink to bash, so bash is running
in limited mode and emulating the Bourne Shell.  The shell detection
logic added in [1] does not work correctly for me because the cmdline
would be 'sh' or '/bin/sh', not 'bash'.  This is what I am getting:

  \033[1;32m====== FooBar_Tests.TC_foo_bar pass ======\033[0m

Let's switch to printf, which does interpret the backslash escapes
as expected by default, regardless of the actual shell in use.

Also fix ttcn3-dumpcap-stop.sh, which was left untouched by [1].

Change-Id: Id28193a7ca00b5501a6852e5b4a5412fbaa5e063
Fixes: [1] bf45a5cff8

ttcn3-dumpcap-stop.sh

@@ -22,11 +22,10 @@ fi
 date
 
 if [ x"$VERDICT" = x"pass" ]; then
-	echo -e "\033[1;32m====== $TESTCASE $VERDICT ======\033[0m"
+	printf "\033[1;32m====== $TESTCASE $VERDICT ======\033[0m\n\n"
 else
-	echo -e "\033[1;31m------ $TESTCASE $VERDICT ------\033[0m"
+	printf "\033[1;31m------ $TESTCASE $VERDICT ------\033[0m\n\n"
 fi
-echo
 
 if [ "z$TTCN3_PCAP_PATH" = "z" ]; then
 	TTCN3_PCAP_PATH=/tmp

ttcn3-tcpdump-stop.sh

@@ -26,21 +26,11 @@ kill_rm_pidfile() {
 
 date
 
-# -e only works/is required only in Bash; in dash/POSIX shells it isn't required and will be part of the output
-# SHELL environment variable doesn't always give name of current shell (e.g. for dash run inside bash...)
-SHELL_NAME="$(cat /proc/$$/cmdline |  tr -d '\0')"
-if [ "$SHELL_NAME" = "bash" ]; then
-	ESCAPE_OPT="-e"
-else
-	ESCAPE_OPT=""
-fi
-
 if [ x"$VERDICT" = x"pass" ]; then
-	echo $ESCAPE_OPT "\033[1;32m====== $TESTCASE $VERDICT ======\033[0m"
+	printf "\033[1;32m====== $TESTCASE $VERDICT ======\033[0m\n\n"
 else
-	echo $ESCAPE_OPT "\033[1;31m------ $TESTCASE $VERDICT ------\033[0m"
+	printf "\033[1;31m------ $TESTCASE $VERDICT ------\033[0m\n\n"
 fi
-echo
 
 if [ "z$TTCN3_PCAP_PATH" = "z" ]; then
 	TTCN3_PCAP_PATH=/tmp