nightly-tarball scripts: more quoting fixes

Signed-off-by: Jeff Squyres <jsquyres@cisco.com>

contrib/build-server/hwloc-nightly-tarball.sh

@@ -181,6 +181,6 @@ for tarball in `cat $pending_coverity`; do
         --coverity-token=$coverity_token \
         --verbose \
         --logfile-dir=$HOME/coverity \
-        --make-args="-j8"
+        --make-args=\"-j8\"
 done
 rm -f $pending_coverity

contrib/build-server/openmpi-nightly-tarball.sh

@@ -187,6 +187,6 @@ for tarball in `cat $pending_coverity`; do
         --verbose \
         --logfile-dir=$HOME/coverity \
         --make-args=-j4 \
-        --configure-args="$coverity_configure_args"
+        --configure-args=\"$coverity_configure_args\"
 done
 rm -f $pending_coverity

contrib/build-server/pmix-nightly-tarball.sh

@@ -191,6 +191,6 @@ for tarball in `cat $pending_coverity`; do
         --verbose \
         --logfile-dir=$HOME/coverity \
         --make-args=-j8 \
-        --configure-args="$coverity_configure_args"
+        --configure-args=\"$coverity_configure_args\"
 done
 rm -f $pending_coverity