Abort QueueItem.block_until_building after 100 HTTPErrors

[Lucas-C]

This aim to avoid this kind of situation:

2020-12-08 02:27:39,955 [ERROR] jenkinsbase.py:81 - Failed request at https://jenkins.example.com/queue/item/20799/api/python with params: None 
2020-12-08 02:27:39,956 [DEBUG] queue.py:153 - 503 Server Error: Service Unavailable for url: https://jenkins.example.com/queue/item/20799/api/python
2020-12-08 02:27:41,429 [ERROR] jenkinsbase.py:81 - Failed request at https://jenkins.example.com/queue/item/20798/api/python with params: None 
2020-12-08 02:27:41,429 [DEBUG] queue.py:153 - 503 Server Error: Service Unavailable for url: https://jenkins.example.com/queue/item/20798/api/python
2020-12-08 02:27:48,277 [ERROR] jenkinsbase.py:81 - Failed request at https://jenkins.example.com/queue/item/20798/api/python with params: None 
2020-12-08 02:27:48,277 [DEBUG] queue.py:153 - 404 Client Error: Not Found for url: https://jenkins.example.com/queue/item/20798/api/python
2020-12-08 02:27:48,278 [ERROR] jenkinsbase.py:81 - Failed request at https://jenkins.example.com/queue/item/20799/api/python with params: None 
2020-12-08 02:27:48,278 [DEBUG] queue.py:153 - 404 Client Error: Not Found for url: https://jenkins.example.com/queue/item/20799/api/python
2020-12-08 02:27:55,125 [ERROR] jenkinsbase.py:81 - Failed request at https://jenkins.example.com/queue/item/20798/api/python with params: None 
2020-12-08 02:27:55,125 [DEBUG] queue.py:153 - 404 Client Error: Not Found for url: https://jenkins.example.com/queue/item/20798/api/python
2020-12-08 02:27:55,127 [ERROR] jenkinsbase.py:81 - Failed request at https://jenkins.example.com/queue/item/20799/api/python with params: None 
2020-12-08 02:27:55,127 [DEBUG] queue.py:153 - 404 Client Error: Not Found for url: https://jenkins.example.com/queue/item/20799/api/python

With MANY HTTP errors occuring, and nothing ever noticing the issue :

$ grep -cF '503 Server Error' execution.log
384
$ grep -cF '404 Client Error' execution.log
1261

This PR aims to detect a problem after Jenkins returned 100 HTTP errors while polling the same job (the value is configurable)