* device-src/s3.c: Handle DURABLE_REDUCED_AVAILABILITY for OAUTH2.
* man/xml-source/amanda-devices.7.xml: Document
  DURABLE_REDUCED_AVAILABILITY for google storage.


git-svn-id: https://svn.code.sf.net/p/amanda/code/amanda/branches/3_3@5284 a8d146d6-cc15-0410-8900-af154a0219e0