Fix shellcheck detected errors

- onos-package
  SC2071: > is for string comparisons. Use -gt instead.

- ./tools/build/onos-blackduck-zip
  SC1035: You need a space after the [ and before the ].

Change-Id: I409b4a181e9cd49795afbdaa68b68c26413b9401

tools/build/onos-blackduck-zip

@@ -39,7 +39,7 @@ check_copy() {
     [ -d "$FOLDER" ] && rm -r $FOLDER
     mkdir $FOLDER
     mvn clean install
-    if [$? -eq 0 ]; then
+    if [ $? -eq 0 ]; then
         cp -r -a * $FOLDER;
         if [ -d "$FOLDER/.git" ]; then
          rm -r $FOLDER/.git

tools/build/onos-package

@@ -204,7 +204,7 @@ function build_rpm() {
 set -e
 
 [[ $# == 0 ]] && ONOS_PACKAGE_TAR_arg=true
-while [[ $# > 0 ]]; do
+while [[ $# -gt 0 ]]; do
 case $1 in
     -t|--tar)
         ONOS_PACKAGE_TAR_arg=true