Tests: minor improvements.

Added "go" availability check before trying to build an application.

update_action() method used were possible and fixed bug with
the relative path determination in test_static_chroot.py.

Templates optimization and style fixes.

test/test_tls_sni.py

@@ -18,7 +18,7 @@ class TestTLSSNI(TestApplicationTLS):
         )
 
     def openssl_date_to_sec_epoch(self, date):
-        return self.date_to_sec_epoch(date, '%b %d %H:%M:%S %Y %Z')
+        return self.date_to_sec_epoch(date, '%b %d %X %Y %Z')
 
     def add_tls(self, cert='default'):
         assert 'success' in self.conf(