[FIX] Odoo 10.0-12.0: make curl download quieter

When downloading wkhtmltopdf, curl shows a progress status unecessary
during the builds.

Author: d-fence

10.0/Dockerfile

@@ -16,7 +16,7 @@ RUN set -x; \
             python-support \
             python-vobject \
             python-watchdog \
-        && curl -o wkhtmltox.deb -SL https://github.com/wkhtmltopdf/wkhtmltopdf/releases/download/0.12.5/wkhtmltox_0.12.5-1.jessie_amd64.deb \
+        && curl -o wkhtmltox.deb -sSL https://github.com/wkhtmltopdf/wkhtmltopdf/releases/download/0.12.5/wkhtmltox_0.12.5-1.jessie_amd64.deb \
         && echo '4d104ff338dc2d2083457b3b1e9baab8ddf14202 wkhtmltox.deb' | sha1sum -c - \
         && dpkg --force-depends -i wkhtmltox.deb \
         && apt-get -y install -f --no-install-recommends \

11.0/Dockerfile

@@ -20,7 +20,7 @@ RUN set -x; \
             python3-vobject \
             python3-watchdog \
             xz-utils \
-        && curl -o wkhtmltox.deb -SL https://github.com/wkhtmltopdf/wkhtmltopdf/releases/download/0.12.5/wkhtmltox_0.12.5-1.stretch_amd64.deb \
+        && curl -o wkhtmltox.deb -sSL https://github.com/wkhtmltopdf/wkhtmltopdf/releases/download/0.12.5/wkhtmltox_0.12.5-1.stretch_amd64.deb \
         && echo '7e35a63f9db14f93ec7feeb0fce76b30c08f2057 wkhtmltox.deb' | sha1sum -c - \
         && dpkg --force-depends -i wkhtmltox.deb\
         && apt-get -y install -f --no-install-recommends \

12.0/Dockerfile

@@ -20,7 +20,7 @@ RUN set -x; \
             python3-vobject \
             python3-watchdog \
             xz-utils \
-        && curl -o wkhtmltox.deb -SL https://github.com/wkhtmltopdf/wkhtmltopdf/releases/download/0.12.5/wkhtmltox_0.12.5-1.stretch_amd64.deb \
+        && curl -o wkhtmltox.deb -sSL https://github.com/wkhtmltopdf/wkhtmltopdf/releases/download/0.12.5/wkhtmltox_0.12.5-1.stretch_amd64.deb \
         && echo '7e35a63f9db14f93ec7feeb0fce76b30c08f2057 wkhtmltox.deb' | sha1sum -c - \
         && dpkg --force-depends -i wkhtmltox.deb\
         && apt-get -y install -f --no-install-recommends \