feat(envoy): Adds more envoy replicas for higher performance. JIRA:PUC-2007

[nicholaskuechler]

WITHOUT THESE CHANGES:

 hey -n 1000 -c 100 -t 60 \
  -H "X-Auth-Token: $TOKEN" \
  -H "Content-Type: application/json" \
  -H "Accept: application/json" \
  "https://nova.{dev}/v2.1/servers/detail?all_tenants=1"


Summary:
  Total:	88.2530 secs
  Slowest:	19.5282 secs
  Fastest:	0.1165 secs
  Average:	7.4501 secs
  Requests/sec:	11.3311

  Total data:	7561162 bytes
  Size/request:	7561 bytes

Response time histogram:
  0.116 [1]	|
  2.058 [123]	|■■■■■■■■■■
  3.999 [47]	|■■■■
  5.940 [69]	|■■■■■■
  7.881 [139]	|■■■■■■■■■■■
  9.822 [500]	|■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■
  11.764 [26]	|■■
  13.705 [24]	|■■
  15.646 [26]	|■■
  17.587 [25]	|■■
  19.528 [20]	|■■


Latency distribution:
  10%% in 0.3598 secs
  25%% in 6.3442 secs
  50%% in 8.0593 secs
  75%% in 8.3804 secs
  90%% in 10.9262 secs
  95%% in 15.1646 secs
  99%% in 18.5521 secs

Details (average, fastest, slowest):
  DNS+dialup:	0.0969 secs, 0.0000 secs, 1.2773 secs
  DNS-lookup:	0.0086 secs, 0.0000 secs, 0.0886 secs
  req write:	0.0000 secs, 0.0000 secs, 0.0012 secs
  resp wait:	7.3530 secs, 0.1163 secs, 19.5281 secs
  resp read:	0.0001 secs, 0.0000 secs, 0.0018 secs

Status code distribution:
  [200]	706 responses
  [503]	294 responses

WITH THESES CHANGES:

 hey -n 1000 -c 100 -t 60 \
  -H "X-Auth-Token: $TOKEN" \
  -H "Content-Type: application/json" \
  -H "Accept: application/json" \
  "https://nova.{dev}/v2.1/servers/detail?all_tenants=1"


Summary:
  Total:	21.9174 secs
  Slowest:	7.5816 secs
  Fastest:	0.6259 secs
  Average:	2.0745 secs
  Requests/sec:	45.6259

  Total data:	10660000 bytes
  Size/request:	10660 bytes

Response time histogram:
  0.626 [1]	|
  1.321 [16]	|■
  2.017 [836]	|■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■
  2.713 [39]	|■■
  3.408 [17]	|■
  4.104 [13]	|■
  4.799 [15]	|■
  5.495 [23]	|■
  6.190 [15]	|■
  6.886 [18]	|■
  7.582 [7]	|


Latency distribution:
  10%% in 1.5871 secs
  25%% in 1.6538 secs
  50%% in 1.7143 secs
  75%% in 1.8331 secs
  90%% in 2.9951 secs
  95%% in 5.1683 secs
  99%% in 6.8246 secs

Details (average, fastest, slowest):
  DNS+dialup:	0.0907 secs, 0.0000 secs, 1.1865 secs
  DNS-lookup:	0.0078 secs, 0.0000 secs, 0.0791 secs
  req write:	0.0000 secs, 0.0000 secs, 0.0010 secs
  resp wait:	1.9836 secs, 0.6258 secs, 6.8937 secs
  resp read:	0.0001 secs, 0.0000 secs, 0.0002 secs

Status code distribution:
  [200]	1000 responses