ffdc: Set PyYAML version requirement to >= 5.3.0

Set PyYAML earliest required version to 5.3.0 so code can run
on more installations without having to do unneeded update.
PyYAML 5.3.0 is selected for some of the fixes it provides.

Signed-off-by: Peter D  Phan <peterp@us.ibm.com>
Change-Id: Ibac6e5ae26b74f635a6a1d1dd30787a6f0e58fba
diff --git a/ffdc/ffdc_collector.py b/ffdc/ffdc_collector.py
index 61590a3..ca79d17 100644
--- a/ffdc/ffdc_collector.py
+++ b/ffdc/ffdc_collector.py
@@ -206,9 +206,9 @@
         self.logger.info("\t{:<10}  {:>9}".format('redfishtool', redfishtool_version))
         self.logger.info("\t{:<10}  {:>12}".format('ipmitool', ipmitool_version))
 
-        if eval(yaml.__version__.replace('.', ',')) < (5, 4, 1):
+        if eval(yaml.__version__.replace('.', ',')) < (5, 3, 0):
             self.logger.error("\n\tERROR: Python or python packages do not meet minimum version requirement.")
-            self.logger.error("\tERROR: PyYAML version 5.4.1 or higher is needed.\n")
+            self.logger.error("\tERROR: PyYAML version 5.3.0 or higher is needed.\n")
             run_env_ok = False
 
         self.logger.info("\t---- End script host environment ----")