Add an ability to limit permitted sessions count for each version

[smecsia]

…sion

[qatools-ci]

SonarQube analysis reported 14 issues:

• 5 critical
• 9 major

Watch the comments in this conversation to review them. Note: the following issues could not be reported as comments because they are located on lines that are not displayed in this pull request:

• Extract this nested try block into a separate method.
• Refactor this code to not nest more than 3 if/for/while/switch/try statements.