Log4j2 update

[kowalczyka]

Changes in this Pull Request:

• hanges related to log4j library upgrade to version 2
• closes #74

Mandatory checks:

• [x] latest changes were fetched from the upstream branch before creating this PR (branch is up to date)
• [x] changes were tested manually
• [x] unit tests were properly implemented
• [ ] communication about interdependent changes has been sent to the team (if applicable)
• [x] respective Jenkins jobs were referenced in additional context section of this PR

OSCM Build References:

• OSCM Build And Push job - #586

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This change is 

[codecov[bot]]

Codecov Report

Merging #75 into master will decrease coverage by 0.12%. The diff coverage is 92.3%.

@@            Coverage Diff             @@
##           master      #75      +/-   ##
==========================================
- Coverage   36.32%   36.19%   -0.13%     
==========================================
  Files         254      254              
  Lines       16417    16369      -48     
  Branches     2163     2162       -1     
==========================================
- Hits         5963     5925      -38     
+ Misses      10141    10130      -11     
- Partials      313      314       +1

Impacted Files	Coverage Δ
...scm-app/src/main/java/org/oscm/app/dao/BesDAO.java	69.53% <100%> (+0.1%)	:arrow_up:
...p/src/main/java/org/oscm/app/domain/Operation.java	88.46% <33.33%> (-0.22%)	:arrow_down:
...main/java/org/oscm/app/dao/ServiceInstanceDAO.java	21.53% <50%> (-0.6%)	:arrow_down:
...c/main/java/org/oscm/app/business/Initializer.java	94.82% <94.44%> (+0.64%)	:arrow_up:
...src/main/java/org/oscm/app/common/Initializer.java	95.08% <94.73%> (+2.58%)	:arrow_up:
...n/java/org/oscm/app/azure/proxy/ProxySettings.java	86.95% <0%> (+10.86%)	:arrow_up:

[GoebelL]

I guess a log4j2.properties.template file needs to be added for the sample adapter.

[kowalczyka]

I guess a log4j2.properties.template file needs to be added for the sample adapter.

This will be handled in separate issue: #76