AEROGEAR-2233 Custom realm name should be used for original KeyCloak service

[vchepeli]

Describe what this PR does and why we need it:
AEROGEAR-2233

Changes proposed in this pull request
When SHARED_REALM is defined:

• Realm name should be created with SHARED_REALM name

Which issue this PR fixes (This will close that issue when PR gets merged)
fixes AEROGEAR-2233

[vchepeli]

ping @maleck13, @philbrookes, @JameelB

[maleck13]

change looks reasonable. I will give it a try

[maleck13]

Test:

• create no realm
• create with realm
• create shared service with realm

[maleck13]

Test worked as expected so I think we just need to get the checks to pass then good to merge

[JameelB]

@vchepeli Looks good to me too. You might have to regenerate the dockerfile?

[JameelB]

@maleck13 @vchepeli Tested locally.

Verified the following test cases:

• Successfully provisioned a shared keycloak with specified realm
• Successfully provisioned a shared keycloak with no realm specified. (Defaulted to the current namespace)
• Successfully provisioned a linked keycloak service with a specified realm
• Successfully provisioned a linked keycloak service with no realm specified (Defaulted to the current namespace).