Implement rpm package building in mock env

* Remove sudo operations with sandbox
* ensure rpm package building in mock env
* defines configuration for rpm build mock env
* currently we have flag USE_MOCK in config.mk
  which is disable mock usage by default
* we are using tmpfs for chroot, which can be disabled

Change-Id: I1298af3eb8e1b1ad516ba0797f133097807759eb
Related-bug: #1348599