Ship our patches in a collabora subdir

Ship our patches in a collabora subdir so it's more obvoius which ones
are collabora obs packaging and not in debian yet.
Signed-off-by: Andrew Lee (李健秋) <andrew.lee@collabora.co.uk>

debian/patches/series

@@ -19,18 +19,18 @@ CVE-2017-5188.patch
 fix-kiwitree-symlink.patch
 handle-links-properly.patch
 dist-Use-2.7-packages-for-testing.patch
-Add_global_configuration_for_a_shared_reprepro.patch
-Add_--ignore=unusedarch_to_reprepro_params.patch
-publish_Also_accept_udebs_into_reprepro_repository.patch
-Seperately_include_debs_and_udebs_into_reprepro.patch
-BSConfig.pm.template_include_a_skeleton_reprepro.patch
-Include_ddebs_in_reprepro_too_and_fix_inclusion_of_udebs.patch
-bs_publish_improve-logging_for_reprepro_invocations.patch
-publisher_reprepro_set_surprising_binary.patch
-Add-support-for-md5-and-sha256-cypted-passwords.patch
-Put-binary-uploads-in-architecture-dependent-subdirectori.patch
-Correct-reprepro-argument-to-match-current-version.patch
-backend-Handle-ERROR_WANT_-READ-WRITE-from-ssl-reads.patch
-backend-Support-https-urls-for-package-downloads.patch
-BSConfig-Make-every-architecture-its-own-relsync-pool.patch
-BSConfig-Read-a-BSConfig.local.pm-if-it-exists.patch
+collabora/Add_global_configuration_for_a_shared_reprepro.patch
+collabora/Add_--ignore=unusedarch_to_reprepro_params.patch
+collabora/publish_Also_accept_udebs_into_reprepro_repository.patch
+collabora/Seperately_include_debs_and_udebs_into_reprepro.patch
+collabora/BSConfig.pm.template_include_a_skeleton_reprepro.patch
+collabora/Include_ddebs_in_reprepro_too_and_fix_inclusion_of_udebs.patch
+collabora/bs_publish_improve-logging_for_reprepro_invocations.patch
+collabora/publisher_reprepro_set_surprising_binary.patch
+collabora/Add-support-for-md5-and-sha256-cypted-passwords.patch
+collabora/Put-binary-uploads-in-architecture-dependent-subdirectori.patch
+collabora/Correct-reprepro-argument-to-match-current-version.patch
+collabora/backend-Handle-ERROR_WANT_-READ-WRITE-from-ssl-reads.patch
+collabora/backend-Support-https-urls-for-package-downloads.patch
+collabora/BSConfig-Make-every-architecture-its-own-relsync-pool.patch
+collabora/BSConfig-Read-a-BSConfig.local.pm-if-it-exists.patch