update device info to add more facts
  add log analyzer
  add check daemon status test
  add check interface status test
  add Mellanox check sfp presence test
  update reboot, config reload and sequential restart test
  update sfp test
  update check sysfs test
  update platform fixture

Rebase to add some new master PR:

  #1130 [platform] Fix the reboot SONiC stuck issue

  #1120 [platform] Disable log analyzer for the reload and restart cases

  #1125 [pytest] Fix pytest conftest.py issue

…evices (#1082)

* [psu test case] check psu state against vendor specific info. for mellanox, check sysfs

* [test_platform_info.py]handle "NOT PRESENT" in test_show_platform_psustatus

* [psu testcase] address comments

Conflicts:
	tests/platform/mellanox/check_sysfs.py

* [check_sysfs] rewords.

* [check_sysfs.py] rewording

Conflicts:
	tests/platform/mellanox/check_sysfs.py

[tests/platform/mellanox] check PSU state against sysfs on Mellanox d…