Make last messages in alarm callback email more readable again

[bernd]

The 1.0 email alarmcallback template formatted the list of messages like this:

Last messages accounting for this alert:

source: example.org | message: GET /posts [200] 98ms { http_response_code: 200 | gl2_source_node: b70c4d8f-2aac-491a-9966-5cc35da7e96d | resource: /posts |
timestamp: 2015-06-05T10:39:29.065Z | http_method: GET | took_ms: 98 | _id: 24c23190-0b6f-11e5-a8e6-56847afe9799 | gl2_source_input: 556ed17be4b0601d88cba7c1
| action: index | user_id: 9001 | streams: [556f1e66e4b0601d88cbfb21] | controller: PostsController }

source: example.org | message: GET /posts [200] 73ms { http_response_code: 200 | gl2_source_node: b70c4d8f-2aac-491a-9966-5cc35da7e96d | resource: /posts |
timestamp: 2015-06-05T10:39:29.036Z | http_method: GET | took_ms: 73 | _id: 24bdc4c0-0b6f-11e5-a8e6-56847afe9799 | gl2_source_input: 556ed17be4b0601d88cba7c1
| action: index | user_id: 6476752 | streams: [556f1e66e4b0601d88cbfb21] | controller: PostsController }

Since 1.1 the list of messages looks like this:

Last messages accounting for this alert:
source: example.org | message: GET /posts [200] 98ms { http_response_code: 200 | gl2_source_node: b70c4d8f-2aac-491a-9966-5cc35da7e96d | resource: /posts |
timestamp: 2015-06-05T10:39:29.065Z | http_method: GET | took_ms: 98 | _id: 24c23190-0b6f-11e5-a8e6-56847afe9799 | gl2_source_input: 556ed17be4b0601d88cba7c1
| action: index | user_id: 9001 | streams: [556f1e66e4b0601d88cbfb21] | controller: PostsController }
source: example.org | message: GET /posts [200] 73ms { http_response_code: 200 | gl2_source_node: b70c4d8f-2aac-491a-9966-5cc35da7e96d | resource: /posts |
timestamp: 2015-06-05T10:39:29.036Z | http_method: GET | took_ms: 73 | _id: 24bdc4c0-0b6f-11e5-a8e6-56847afe9799 | gl2_source_input: 556ed17be4b0601d88cba7c1
| action: index | user_id: 6476752 | streams: [556f1e66e4b0601d88cbfb21] | controller: PostsController }

This makes it really hard to see where one message ends and the other one starts.