Clenaup debian dependencies (allegro#2943)

* debian/rules: fix dh_strip on xenial

fixes:

```
strip: debian/ralph-core/opt/ralph/ralph-core/lib/python3.5/site-packages/st629Rf8:
Not enough room for program headers, try linking with -N
```

* deb: clenaup dependencies

* deb: build assets

debian/control

@@ -2,13 +2,12 @@ Source: ralph
 Section: python
 Priority: extra
 Maintainer: [email protected]
-Build-Depends: debhelper (>= 9), python
+Build-Depends: debhelper (>= 9), dh-virtualenv, git, libmysqlclient-dev, python3-virtualenv, python3 (>=3.4), python3-dev (>=3.4), libffi-dev, nodejs, nodejs-legacy
 Standards-Version: 3.9.5
 
 Package: ralph-core
 Architecture: amd64
-Pre-Depends: dpkg (>= 1.16.1), python3.4, ${misc:Pre-Depends}
-Depends: git,libmysqlclient-dev,python-virtualenv,python-dev,python3.4,python3.4-dev
+Pre-Depends: dpkg (>= 1.16.1), python (>=3.4), ${misc:Pre-Depends}
 Description: Ralph is an DCIM/CMDB - asset management for Data Centers/ Back Office.
 Homepage: http://ralph.allegrogroup.com
 Suggests: mysql-server, redis

debian/rules

@@ -6,7 +6,13 @@ export DH_VIRTUALENV_INSTALL_ROOT=/opt/ralph
 	dh $@ --with python-virtualenv
 
 override_dh_virtualenv:
+	npm install
+	node_modules/bower/bin/bower --allow-root install
+	node_modules/gulp/bin/gulp.js
 	dh_virtualenv --python /usr/bin/python3.4
 
 override_dh_shlibdeps:
 	dh_shlibdeps --dpkg-shlibdeps-params=--ignore-missing-info
+
+override_dh_strip:
+	dh_strip --exclude=_cffi_backend