Bug 12271: add Bootstrap templates to valid-templates.t tests

valid-templates.t actually tests the templates and includes of only
the "prog" theme at opac and intranet.  It does not test the opac
templates and includes of bootstrap theme, nor ccsr.  This is critical
since this test is used for patch integrations in release maintenance.

This patch adds the test of bootstrap opac theme.
I did not manage to add the ccsr theme since it is not a real theme,
meaning it has no templates and not all includes.

Test by runnning perl xt/author/valid-templates.t and looking at the
logs.

Signed-off-by: Bernardo Gonzalez Kriegel <bgkriegel@gmail.com>
Now there are 902 lines, bootstrap tested (1 error detected!)
No koha-qa errors

Signed-off-by: Galen Charlton <gmc@esilibrary.com>
Bug 12271: (follow-up) teach valid-templates.t how to include specified templates

Two of the template includes in the Bootstrap theme cannot be tested
all by themselves because they require that the template that includes
them define BLOCKs.  This patch ensures that they are excluded
from individual testing; they will get exercised sufficiently by being
including by all of the other Bootstrap templates.

Signed-off-by: Galen Charlton <gmc@esilibrary.com>
Bug 12271: (follow-up) fix minor errors in Bootstrap theme

To test:

[1] Verify that prove -v xt/author/valid-templates.t passes.

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