cleanup: Drop never used path for httpd's ccache

`HTTP_CCACHE` path was introduced in [0], but hasn't been set as
gssproxy's cred_store option(`ccache`) and nowhere is really
used besides the removing of this not existed path. It is safe to
drop all referencies for `HTTP_CCACHE`.

As of 0.8.0[1] gssproxy uses `MEMORY` credentials type for cred_store
as default.

[0]: https://github.com/freeipa/freeipa/commit/d2f5fc304f1938d23171ae330fa20b213ceed54e
[1]: https://github.com/gssapi/gssproxy/commit/0e1b4a0c8400f1c9c6cc4915942a8df47e0c1410

Signed-off-by: Stanislav Levin <slev@altlinux.org>
Reviewed-By: Alexander Bokovoy <abokovoy@redhat.com>

ipaserver/install/httpinstance.py

@@ -172,7 +172,6 @@ class HTTPInstance(service.Service):
         # Clean up existing ccaches
         # Make sure that empty env is passed to avoid passing KRB5CCNAME from
         # current env
-        ipautil.remove_file(paths.HTTP_CCACHE)
         shutil.rmtree(paths.IPA_CCACHES)
         ipautil.run(
             [paths.SYSTEMD_TMPFILES, '--create', '--prefix', paths.IPA_CCACHES]
@@ -543,7 +542,6 @@ class HTTPInstance(service.Service):
         # Remove the configuration files we create
         ipautil.remove_keytab(self.keytab)
         remove_files = [
-            paths.HTTP_CCACHE,
             paths.HTTPD_CERT_FILE,
             paths.HTTPD_KEY_FILE,
             paths.HTTPD_PASSWD_FILE_FMT.format(host=api.env.host),