package_install: increase buffer for package upload from 300 to 360
seconds

- one empirical observation of upload time shows an upload time of 299
  seconds for imac and 336 seconds for ronin. Since GH avails
  downloads before they end being uploaded, this is a mitigating
  strategy to avoid having the first download attempt obtain only a
  partial file, failing the first installation attempt.
comments: remove outdated comment from dogen application management
package_install: add fixme for no uploads case
package_install: get file by id and delete it from server
package_install: fix incorrect exit status from remote package deletion