Created CL is not cleaned on failed submit

[k-dovgan]

Description

If submit fails, reconciled changes are stored in newly created CL; this behaviour interferes with automation.

Steps to reproduce

1. Configure special p4 submit requirements, such as mandatory review or explicit CL description.
2. Use Universum to submit a CL not meeting those requirements.

Expected result

Exception logged; local files left unchanged; created CL deleted; changes in VCS reverted

Actual result

Exception logged; local files left unchanged; created CL left hanging with all changes added for VCS

[k-dovgan]

Here's the list of possible scenarios, leading to this error:

• requirements of special CL description format not fulfilled
• requirements of mandatory code review not fulfilled
• no 'write' rights for the target
• submitted files have been changed since CL creation (e.g. by another user)
• server-side problems (e.g. server application crashed)
• network problems (e.g. server temporarily inaccessible)

[i-keliukh]

Please create separate issue for tracking the implementation of test for handling of submit failure and copy the description of the scenarios there.

[k-dovgan]

See #396

[k-dovgan]

Fixed by #409