Resolve the "importerror" which is raised after adding 'postinst'
1\ Update the Constants for referring TCT_SHELL_HOME
2\ Update the default suite package folder

       /home/package/  ==> /opt/tct/packages/
Add health check for device
Signed-off-by: b584 <b584@borqs.com>
update the health check for enhancement
Merge pull request #8 from xiaor186/add-health-check

Add health check for device