Add drvier libguestfs to support deploy more operator system,
you can use it by edit host config file add 'image_deploy_driver: libguestfs'.
By the default host-deploy support run three guestfish at the same time.
And host deployer will recycle free guestfish every ten minitues.
cherrypick: release/3.6
* notify: log with context info
* region: guests: log with context info
* region: hosts: log with context info
* region: misc: remove redundant log
* region: skus: use NewInternalServerError instead of NewGeneralError
* appsrv: dispatcher: preserve text id
* appsrv: dispatcher: remove commented-out code
* cloudcommon: db_dispatcher: note errors that won't be translated
* cloudcommon: db: rbac: preserve text id
* cloudcommon: caller: preserve text id
* treewide: fix fmt string
* region: guest_actions: preserve text id
* region: guest_actions: fix fmt string
* region: usages: fix fmt string
* mcclient: hosts: remove redundant return value
* cloudcommon: fetch: preserve text id
* region: guest_template: preserve text id
* cloudcommon: db: db_dispatcher: preserve text id
* region: guest_actions: preserve text id
* httperrors: add funcs for wrap lang tag into context
* vendor: golang.org/x/text
* httperrors: error with context
* httperrors: HTTPError
* treewide: fix typo
* treewide: use en in source code
* locales: initial version
1. There is only one esxi agent needed in OneCloud.
2. Workspace path shoule be EsxiAgentPath not the parent directory of this.
3. The VM name is too long for vcenter when importing VM so that shrink
it.
1. 修改了host-deployer 使其支持 vmware vddk 的 deploy guest fs 操作。
2. esxi agent python ==> Go
fix(esxi-agent): Fix some bugs and irregular contents
fix(esxi-agent): Partial parameter structure
fix(esxi-agent): Add ovf template and remove some binary file
fix(esxi-agent): Format Code
fix(esxi-agent): fix based on reviewers' comments
fix(esxi-agent): fix host-deployer because of occasional unknown panic
fix: DelayTask should have a new Context
fix(esxi-agent): call hostutils.DelayTask
change '_interface' package to 'iagent' package
fix(esxi-agent): Fix some irregular code
