Improve node update - add SGX checks

We had situations when validators provided incorrect values in the .env and started the update procedure with wrong values.

The proposal is to improve the checks BEFORE performing the update procedure.
If checks are not passing, the update procedure should be canceled with the error message. Existing containers should continue working without interruptions. Checks structure should be modular and unified so we can easily add new checks in the future or disable some of the different node types.

Proposed initial checks:

• Disk check (already exist, should be added to the unified checks procedure)
• Manager and IMA aliases check (already exist, should be added to the unified checks procedure)
• NEW SGX check - node-cli should get the list of ALL keynames on the node and request each key using the provided SGX URL (no additional libraries, just plain requests) - procedure should fail if some keys are not found.

Initially proposed by @olehnikolaiev , he can provide more details.