* [TD-4025]<fix>: travis ci broken due to valgrind dependency missed.

modify smoketest.sh to python3.8

* [TD-4025]<fix>: travis ci broken due to ubuntu 20.04 repo issue.

* [TD-4025]<fix>: travis ci broken due to ubuntu 20.04 repo issue.

* [TD-4025]<fix>: travis ci broken due to ubuntu 20.04 repo issue.

* [TD-4025]<fix>: travis ci broken due to valgrind dependency missed.

change focal to bionic.

* [TD-4025]<fix>: travis ci broken due to ubuntu 20.04 repo issue.

cherry pick from master.
Co-authored-by: NShuduo Sang <sdsang@taosdata.com>

2. use install.sh to install odbcinst/odbc record in system
3. add packages (unixodbc/unixodbc-dev) to install in .travis.yml

[TD-1022]

[TD-862]

[TD-788]

1. put the definitions of variables long_shifts and short_shifts and
function shift_crc() in #ifndef _TD_ARM_, because this function and
these variables are not used/called for arm64 build in travis. Hence
warnings come up as errors.
2. Added arm64 jobs into .travis.yml by adding -DCPUTYPE=aarch64 with
cmake command.
Signed-off-by: Nodidev <odidev@puresoftware.com>

[TD-630]