Add support for Entity Association Record

Adding support for Entity Association Record (SDR type - 0x08h)
This patch includes:
1) Entity Association Record yaml file example
2) Entity Assocation Record related script and mako file changes
3) Adding Entity Association Record in get_sdr IPMI command response

From the host, tested that entity association records can be fetched

Change-Id: I9cf598e5d27d2e8c6751bbaae2176e7c976974b1
Tested: Yes
Signed-off-by: Jaghathiswari Rankappagounder Natarajan <jaghu@google.com>
diff --git a/scripts/entity-example.yaml b/scripts/entity-example.yaml
new file mode 100755
index 0000000..2db14cc
--- /dev/null
+++ b/scripts/entity-example.yaml
@@ -0,0 +1,127 @@
+# This record has:
+# Container Entity Id and Container Entity Instance = (0x13, 0x81)
+# Contained Entity Id and Contained Entity Instance = (0x0A, 0x1),
+# (0x0A, 0x3), (0x0A, 0x5), (0x0A, 0x7)
+# Entity Record id is the key
+0x01:
+  # Container entity contains other entities
+  # Entity Id and entity Instance for the container entity
+  containerEntityId: 0x13
+  containerEntityInstance: 0x81
+  # A record can have contained entities as a four entry list or as upto
+  # two ranges of entity instances; this record has contained entities
+  # as a four entry list
+  isList: "true"
+  # Records can be linked if necessary to extend the number of contained
+  # entities within a container entity; this record is not linked
+  isLinked: "false"
+  entityId1: 0x0A
+  entityInstance1: 0x1
+  entityId2: 0x0A
+  entityInstance2: 0x3
+  entityId3: 0x0A
+  entityInstance3: 0x5
+  entityId4: 0x0A
+  entityInstance4: 0x7
+
+# The below two records have:
+# Container Entity Id and Container Entity Instance = (0x18, 0x2)
+# Contained Entity Id and Contained Entity Instance = (0x1D, 0x1),
+# (0x1D, 0x4), (0x1D, 0x6), (0x2B, 0x1), (0x2B, 0x3), (0x0F, 0x1),
+# (0x0F, 0x3), (0x10, 0x5)
+0x02:
+  containerEntityId: 0x18
+  containerEntityInstance: 0x2
+  # This record  has contained entities as a four entry list
+  isList: "true"
+  # This record is linked with the below record; this record and the
+  # below record have the same container entity Id and container entity
+  # instance;
+  isLinked: "true"
+  entityId1: 0x1D
+  entityInstance1: 0x1
+  entityId2: 0x1D
+  entityInstance2: 0x4
+  entityId3: 0x1D
+  entityInstance3: 0x6
+  entityId4: 0x2B
+  entityInstance4: 0x1
+
+0x03:
+  containerEntityId: 0x18
+  containerEntityInstance: 0x2
+  # This record  has contained entities as a four entry list
+  isList: "true"
+  # This record is linked with the above record; this record and the
+  # above record have the same container entity Id and container entity
+  # instance
+  isLinked: "true"
+  entityId1: 0x2B
+  entityInstance1: 0x3
+  entityId2: 0x0F
+  entityInstance2: 0x1
+  entityId3: 0x0F
+  entityInstance3: 0x3
+  entityId4: 0x10
+  entityInstance4: 0x5
+
+# This record has:
+# Container Entity Id and Container Entity Instance = (0x1E, 0x1)
+# Contained Entity Id and Contained Entity Instance = (0x20, 0x1),
+# (0x20, 0x2), (0x20, 0x3), (0x20, 0x7), (0x20, 0x8), (0x20, 0x9)
+0x04:
+  containerEntityId: 0x1E
+  containerEntityInstance: 0x1
+  # This record has contained entities as two ranges of entity instances
+  isList: "false"
+  # This record is not linked
+  isLinked: "false"
+  entityId1: 0x20
+  entityInstance1: 0x1
+  entityId2: 0x20
+  entityInstance2: 0x3
+  entityId3: 0x20
+  entityInstance3: 0x7
+  entityId4: 0x20
+  entityInstance4: 0x9
+
+# The below two records have:
+# Container Entity Id and Container Entity Instance = (0x1E, 0x3)
+# Contained Entity Id and Contained Entity Instance = (0x20, 0x1),
+# (0x20, 0x2), (0x20, 0x3), (0x20, 0x6), (0x20, 0x7), (0x20, 0x8),
+# (0x20, 0xA), (0x20, 0xB), (0x20, 0xD), (0x20, 0xE), (0x20, 0xF)
+0x05:
+  containerEntityId: 0x1E
+  containerEntityInstance: 0x03
+  # This record has contained entities as two ranges of entity instances
+  isList: "false"
+  # This record is linked with the below record; this record and the
+  # below record have the same container entity Id and container entity
+  # instance;
+  isLinked: "true"
+  entityId1: 0x20
+  entityInstance1: 0x1
+  entityId2: 0x20
+  entityInstance2: 0x3
+  entityId3: 0x20
+  entityInstance3: 0x6
+  entityId4: 0x20
+  entityInstance4: 0x8
+
+0x06:
+  containerEntityId: 0x1E
+  containerEntityInstance: 0x03
+  # This record has contained entities as two ranges of entity instances
+  isList: "false"
+  # This record is linked with the above record; this record and the
+  # above record have the same container entity Id and container entity
+  # instance;
+  isLinked: "true"
+  entityId1: 0x20
+  entityInstance1: 0xA
+  entityId2: 0x20
+  entityInstance2: 0xB
+  entityId3: 0x20
+  entityInstance3: 0xD
+  entityId4: 0x20
+  entityInstance4: 0xF