PEL: Add PEL Manager class

This class will have the logic for how to handle PELs.  It will
also eventually provide D-Bus interfaces.

This first commit has stubs, plus some basic code to find if a PEL
is being passed in with the OpenBMC event log.

Signed-off-by: Matt Spinler <spinler@us.ibm.com>
Change-Id: I55a5da4d2239c688fded31c112895c3c92bab56d
diff --git a/extensions/openpower-pels/openpower-pels.mk b/extensions/openpower-pels/openpower-pels.mk
index 717fdca..1030171 100644
--- a/extensions/openpower-pels/openpower-pels.mk
+++ b/extensions/openpower-pels/openpower-pels.mk
@@ -1,3 +1,4 @@
 phosphor_log_manager_SOURCES += \
-	extensions/openpower-pels/entry_points.cpp
+	extensions/openpower-pels/entry_points.cpp \
+	extensions/openpower-pels/manager.cpp