Bug 8952: Add http:// to url in social media links on opac-detail

This patch adds a variable to the template, "protocol" based on
whether "using_https" is set. The appropriate protocol is
inserted before social media links.

To test, confirm that  OPACBaseURL is set and lacks "http(s)://"
Social media links should include correct URLs.

A follow-up patch could copy use of this [% protocol %] variable
in other parts of this template which duplicate large chunks of
HTML based on [% using_https %].

Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Galen Charlton <gmc@esilibrary.com>
Bug 8952: (follow-up) change occurrences of using_https

Signed-off-by: Corey Fuimaono <agent.075@gmail.com>
Verified.
Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>

Signed-off-by: Galen Charlton <gmc@esilibrary.com>
Bug 8952: (follow-up) using_https does not deal with Plack

When using Plack, the https method returns 'OFF'.
We have to test this value before sending the value to templates.

Test plan:
1/ Fill your OPACBaseUrl

2/ Configure apache for using http
3/ Check the social networks links (should be http://OPACBaseUrl)

4/ Launch Plack
5/ Check the social networks link (should be http://OPACBaseUrl)
6/ Stop Plack

7/ Configure apache for using https
  sudo openssl req -x509 -nodes -days 365 -newkey rsa:1024 -out
/etc/apache2/server.crt -keyout /etc/apache2/server.key
and add in you virtualhost (with :443)
    SSLEngine on
    SSLCertificateFile /etc/apache2/server.crt
    SSLCertificateKeyFile /etc/apache2/server.key
  a2enmod ssl
  service apache2 restart
8/ Check the social networks links (should be https://OPACBaseUrl)

FIXME: Under Plack, with ssl actived, the CGI->https() method always
returns 'OFF'.

Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Galen Charlton <gmc@esilibrary.com>
Bug 8952: (follow-up) remove hard-coded LFTL ID added by a previous patch

Signed-off-by: Galen Charlton <gmc@esilibrary.com>
Bug 8952: (follow-up) apply link change for social networks to Bootstrap theme

Signed-off-by: Galen Charlton <gmc@esilibrary.com>