Start building sysrepo-ietf-alarms

The project also requires date library[1] but it was not running
correctly on our ARM. I had to patch the library with the workaround
from [2], hence the buildroot update.

[1] https://github.com/HowardHinnant/date
[2] https://github.com/HowardHinnant/date/issues/252

Change-Id: Ie82b8c9ea50b0198b024256ff81d67ba7344c190
diff --git a/tests/czechlight-cfg-fs/migrations.py b/tests/czechlight-cfg-fs/migrations.py
index 87f4b4a..d243d06 100644
--- a/tests/czechlight-cfg-fs/migrations.py
+++ b/tests/czechlight-cfg-fs/migrations.py
@@ -21,6 +21,7 @@
 
 CLA_SYSREPO_PATH = BR2_ROOT / 'submodules/cla-sysrepo'
 VELIA_PATH = BR2_ROOT / 'submodules/velia'
+ALARMS_PATH = BR2_ROOT / 'submodules/sysrepo-ietf-alarms'
 NETOPEER2_PATH = BR2_ROOT / 'submodules/dependencies/Netopeer2'
 
 
@@ -68,6 +69,7 @@
         res['SYSREPO_REPOSITORY_PATH'] = self._running_directory / 'sysrepo_repository'
         res['CLA_YANG'] = CLA_SYSREPO_PATH / 'yang'
         res['VELIA_YANG'] = VELIA_PATH / 'yang'
+        res['ALARMS_YANG'] = ALARMS_PATH / 'yang'
         res['PROC_CMDLINE'] = self.proc_cmdline
         res['CFG_VERSION_FILE'] = self.version_file
         res['CFG_STARTUP_FILE'] = self.startup_file