coverage-reporting/merge.sh: Remove unneeded "clear" commands

Having these run behind user's back only complicates matter - it erases
some of script's own output, not speaking about previous terminal contents
users may want to keep seeing.

Signed-off-by: Paul Sokolovsky <paul.sokolovsky@linaro.org>
diff --git a/coverage-tool/coverage-reporting/merge.sh b/coverage-tool/coverage-reporting/merge.sh
index 841c459..dbe5f0a 100755
--- a/coverage-tool/coverage-reporting/merge.sh
+++ b/coverage-tool/coverage-reporting/merge.sh
@@ -268,7 +268,6 @@
 #   Prints to stdout script usage
 ################################################################
 usage() {
-  clear
   echo "Usage:"
   echo "merge -h              Display this help message."
   echo "-j <input json file>  Input json file(info and intermediate json files to be merged)."
@@ -332,7 +331,6 @@
 EOF
 )
 
-clear
 # Local workspace folder to contain source files
 LOCAL_WORKSPACE=""
 # If this is true then will clone/copy sources from merged json