could not import sqlite3 module when executing cbworkloadgen, cbbackup, cbrestore and cbtransfer in non-root installation

Download couchbase server 2.0.1-170
Login as non-root user (test)
Extract couchbase server binary as in https://github.com/couchbase/voltron/blob/2.0.1/README-non-root.md
Start couchbase server
Open web browser to do initial setup.
Go to opt/couchbase/bin/tools
Run cbworkloadgen ==> failed

test@ip-10-33-3-109 tools]$ pwd
/home/test/opt/couchbase/bin/tools
[test@ip-10-33-3-109 tools]$ ./cbworkloadgen
Error: could not import sqlite3 module
[test@ip-10-33-3-109 tools]$ cd ..
[test@ip-10-33-3-109 bin]$ ./tools/cbworkloadgen
Error: could not import sqlite3 module

[test@ip-10-33-3-109 bin]$ ./cbbackup
Error: could not import sqlite3 module

[test@ip-10-33-3-109 bin]$ ./cbrestore
Error: could not import sqlite3 module

[test@ip-10-33-3-109 bin]$ ./cbtransfer
Error: could not import sqlite3 module