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
diff --git a/tools/build/onos-blackduck-zip b/tools/build/onos-blackduck-zip
index 5b0e8b7..8760460 100755
--- a/tools/build/onos-blackduck-zip
+++ b/tools/build/onos-blackduck-zip
@@ -39,7 +39,7 @@
     [ -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
@@ -65,4 +65,4 @@
 rm -r $FOLDER
 
 cd $ONOS_ROOT
-git checkout $CURRENT_TAG
\ No newline at end of file
+git checkout $CURRENT_TAG