Correct resources requirements in Helm Charts

Casablanca Helm Charts includes resource requirements

https://jira.onap.org/browse/OOM-1145

2 flavors are defined: a small for basic installation and a large for deployment

The minimum requests for AAI components are very huge and should be dramatically reduced to avoid wasting resources:

Small: 18 vCPU and 36 GB memory

Large: 48 vCPU and 96 GB memory

Small:
project                                 small.requests.memory    small.requests.cpu

--------------------------------------  -----------------------  --------------------

aai/aai-babel                           2Gi                      1

aai/aai-cassandra                       -                        -

aai/aai-champ                           4Gi                      2

aai/aai-data-router                     2Gi                      1

aai/aai-elasticsearch                   2Gi                      1

aai/aai-gizmo                           2Gi                      1

aai/aai-graphadmin                      4Gi                      2

aai/aai-modelloader                     2Gi                      1

aai/aai-resources                       4Gi                      2

aai/aai-search-data                     2Gi                      1

aai/aai-sparky-be                       4Gi                      2

aai/aai-spike                           4Gi                      2

aai/aai-traversal                       4Gi                      2

Large:

project                                 large.requests.memory    large.requests.cpu
--------------------------------------  -----------------------  --------------------
aai/aai-babel                           8Gi                      4
aai/aai-cassandra                       -                        -
aai/aai-champ                           8Gi                      4
aai/aai-data-router                     8Gi                      4
aai/aai-elasticsearch                   8Gi                      4
aai/aai-gizmo                           8Gi                      4
aai/aai-graphadmin                      8Gi                      4
aai/aai-modelloader                     8Gi                      4
aai/aai-resources                       8Gi                      4
aai/aai-search-data                     8Gi                      4
aai/aai-sparky-be                       8Gi                      4
aai/aai-spike                           8Gi                      4
aai/aai-traversal                       8Gi                      4

Example of resource usage for ONAP deployments:

>kubectl top pods -n onap | grep aai

demo-aai-aai-babel-666f76bb9f-6qdpp 1m 478Mi
demo-aai-aai-cassandra-0 453m 286Mi
demo-aai-aai-champ-6c9f9c945-5jb7j 1m 475Mi
demo-aai-aai-data-router-7687b4549b-b7xw4 1m 769Mi
demo-aai-aai-elasticsearch-569b4b7558-v7tn2 2m 1330Mi
demo-aai-aai-gizmo-766f8b567-9mjqq 1m 635Mi
demo-aai-aai-graphadmin-7bb7d97b77-2pm9s 1m 851Mi
demo-aai-aai-modelloader-8489989fbd-6tkjv 0m 476Mi
demo-aai-aai-resources-56d8d66b-dhfg8 1m 899Mi
demo-aai-aai-search-data-6b7dd865-wfmlr 1m 1483Mi
demo-aai-aai-spike-665b749459-2m9pp 1002m 668Mi