fix(plugins): ensure plugins dir is created for deb and rpm

deploy/packages/deb/debian/rules

@@ -34,6 +34,8 @@ install: build
 	mkdir -p debian/emqx/var/run/emqx
 	mkdir -p debian/emqx/var/log/emqx
 	mkdir -p debian/emqx/usr/lib/emqx/bin
+	mkdir -p debian/emqx/usr/lib/emqx/plugins
+	touch debian/emqx/usr/lib/emqx/plugins/.keep
 	mkdir -p debian/emqx/etc/emqx
 	cp bin/* debian/emqx/usr/lib/emqx/bin
 	cp -R lib debian/emqx/usr/lib/emqx

deploy/packages/rpm/emqx.spec

@@ -35,6 +35,7 @@ EMQX, a distributed, massively scalable, highly extensible MQTT message broker.
 
 %install
 mkdir -p %{buildroot}%{_lib_home}
+mkdir -p %{buildroot}%{_lib_home}/plugins
 mkdir -p %{buildroot}%{_log_dir}
 mkdir -p %{buildroot}%{_unitdir}
 mkdir -p %{buildroot}%{_conf_dir}
@@ -42,6 +43,7 @@ mkdir -p %{buildroot}%{_bindir}
 mkdir -p %{buildroot}%{_var_home}
 
 cp -R %{_reldir}/lib %{buildroot}%{_lib_home}/
+touch %{buildroot}%{_lib_home}/plugins/.keep
 cp -R %{_reldir}/erts-* %{buildroot}%{_lib_home}/
 cp -R %{_reldir}/releases %{buildroot}%{_lib_home}/
 cp -R %{_reldir}/bin %{buildroot}%{_lib_home}/