slapdtest: Use "CI" instead of "Travis" in function name

We want this to work on any kind of CI, not just the one we use now.

Lib/slapdtest/_slapdtest.py

@@ -64,7 +64,7 @@ def identity(test_item):
     return test_item
 
 
-def skip_unless_travis(reason):
+def skip_unless_ci(reason):
     """Skip test unless test case is executed on CI like Travis CI
     """
     if os.environ.get('CI', False):
@@ -81,9 +81,9 @@ def requires_tls(skip_nss=False):
     :param skip_nss: Skip test when libldap is compiled with NSS as TLS lib
     """
     if not ldap.TLS_AVAIL:
-        return skip_unless_travis("test needs ldap.TLS_AVAIL")
+        return skip_unless_ci("test needs ldap.TLS_AVAIL")
     elif skip_nss and ldap.get_option(ldap.OPT_X_TLS_PACKAGE) == 'MozNSS':
-        return skip_unless_travis(
+        return skip_unless_ci(
             "Test doesn't work correctly with Mozilla NSS, see "
             "https://bugzilla.redhat.com/show_bug.cgi?id=1519167"
         )