control: Pass event groups when enabling triggers

The `init` and `signal` triggers need to use the event groups when
retrieving group member values and subscribing to signals respectively.
This is t

control: Pass event groups when enabling triggers

The `init` and `signal` triggers need to use the event groups when
retrieving group member values and subscribing to signals respectively.
This is the first step towards fixing that actions are optional on
events and the design direction that `init` and `signal` triggers will
use the event groups (which may or may not be the same as the groups on
same event's actions) when populating/updating the cached state of all
the group members.

Change-Id: Id5a1891f94572d6c843d98603eb1c8233471e23c
Signed-off-by: Matthew Barth <msbarth@us.ibm.com>

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control: Remove manager parameter from create trigger function

The pointer to the manager object is no longer needed when creating a
trigger since its provided when the trigger is enabled.

Change-I

control: Remove manager parameter from create trigger function

The pointer to the manager object is no longer needed when creating a
trigger since its provided when the trigger is enabled.

Change-Id: Ib5b3923bf87c405243630e622f383b27f50453a5
Signed-off-by: Matthew Barth <msbarth@us.ibm.com>

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control: Store/use trigger enable functions on events

Create and store trigger enablement functions on the events based on the
trigger's configuration so that they can be enabled separately from whe

control: Store/use trigger enable functions on events

Create and store trigger enablement functions on the events based on the
trigger's configuration so that they can be enabled separately from when
the event is created. This will allow actions that load events to be
able to be parsed and then enabled when the action determines that the
events should be enabled. It also supports the use of SIGHUP to reload
the event configuration since the events JSON configuration must
successfully be loaded before the newly created events can be enabled in
place of the currently enabled events.

Change-Id: I31871ee1691d5e6b26fe16cde2a829c426ad6504
Signed-off-by: Matthew Barth <msbarth@us.ibm.com>

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