Satellite-managed encryption passphrase: Backend updates

[mobyvb]

Support creating these types of projects via API if config is enabled

Use KMS credentials to request master key from KMS

• ensure there is an easy way to test in storj-up/testing environments even without a dedicated KMS

If a new "satellite-managed encryption" project is created:

• generate a cryptographically random passphrase
• encrypt this passphrase into projects.passphrase_enc, using the master key from the KMS
• set projects.path_encryption to true

[storj-gerrit]

Change satellite/{console,kms}: add setup for kms mentions this issue.

[storj-gerrit]

Change satellite/{console,db}: create satellite managed encryption projects mentions this issue.