Allow mail mock to retrieve initial user emails

[GoebelL]

Changes in this Pull Request:

• In case if mail mock is used, the initial admin credential emails are routed to the executing user.

Mandatory checks:

• [X] Branch is up to date (latest changes were fetched from the upstream branch before creating this PR)
• [X] Changes were tested manually
• [x] Java code changes are unit tested
• [x] Webtests are successful

To be checked by the reviewer:

• [x] Clean Java code and unit tested changes
• [ ] UI customizablity is preserved: No hard-coded styling and URL references in JSF views

To be checked by the pull request owner:

• [ ] .MASTER/job/BES_MASTER_IT/
• [ ] .MASTER/job/OSCM_WS_Tests_INTERNAL/
• [ ] .MASTER/job/OSCM_WS_Tests_OIDC/
• [ ] .MASTER/job/OSCM_Integration_Tests_INTERNAL/
• [ ] .MASTER/job/OSCM_Integration_Tests_OIDC/

Cross repository and core changes:

• [ ] Interdependent changes have been communicated to the team (if applicable)
• [ ] This pull request includes high risk modifications or core changes (e.g API, datamodel, authentication...). Mandatory reviewers: @goebell or @kowalczyka.

OSCM Build References: ./view/Docker_OSCM/job/OSCM_Docker_Build_and_push/456/

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This change is 

[codecov[bot]]

Codecov Report

Merging #1241 (974473c) into master (7749bae) will increase coverage by 0.17%. The diff coverage is 74.53%.

@@             Coverage Diff              @@
##             master    #1241      +/-   ##
============================================
+ Coverage     55.30%   55.47%   +0.17%     
- Complexity    14396    14427      +31     
============================================
  Files          1375     1375              
  Lines         80438    80474      +36     
  Branches       8594     8598       +4     
============================================
+ Hits          44486    44643     +157     
+ Misses        33273    33141     -132     
- Partials       2679     2690      +11     

Impacted Files	Coverage Δ	Complexity Δ
...vasrc/org/oscm/communicationservice/Constants.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
...nicationservice/bean/CommunicationServiceBean.java	67.67% <67.67%> (+54.94%)	32.00 <32.00> (+23.00)
...oscm/identityservice/bean/IdentityServiceBean.java	31.37% <92.04%> (+0.41%)	95.00 <2.00> (+2.00)
.../oscm/identityservice/control/SendMailControl.java	92.00% <100.00%> (+2.00%)	10.00 <2.00> (+2.00)
...oscm/communicationservice/data/SendMailStatus.java	100.00% <0.00%> (+20.00%)	4.00% <0.00%> (+1.00%)
...m/communicationservice/smtp/SMTPAuthenticator.java	75.00% <0.00%> (+75.00%)	3.00% <0.00%> (+3.00%)