Remove NONE debug level

[okolesnyk]

With the next major release of MFTF; the below commands need XSD schema validation turned on my default. The current ability to turn off validation will need to be deprecated.

Commands that have --debug flag

• help NO
• list NO
• reset NO
• static-checks YES
• build:project NO
• generate:docs YES
• generate:suite YES
• generate:tests YES
• generate:urn-catalog NO
• run:failed YES
• run:group YES
• run:test YES
• setup:env NO
• upgrade:tests YES

AC

• --debug flag no longer accepts --debug NONE
• --debug accepts:
  • DEFAULT or no input
  • DEVELOPER
• DEVELOPER debug changes:
  • XSD schema validation is done with non-merged schema
  • (for info, in DEFAULT we merge all entities into single XML file and check schema that way, DEVELOPER needs to not merge and use the non-merged schema for validation)
• MANUAL test created