Fix Ice Tea test execution order to be sorted by names.

[mprse]

Description

This patch provides proposition to sort list of Ice Tea tests to be executed (and shown in results table) by name .
While working on SPI communication test PR #8443 I found that test cases listed in final results are scattered and the readability is poor.

The tests verifies spi modes, buffers, freq, symbol sizes, etc. On the picture below we can see that all cases are mixed and it is hard to look for results for the specific group of cases.

Below are the results with the fix (sorted by names). Now it is easy to check the results for the specific group (e.g. BUFFERS tests).

Pull request type

[X] Fix
[ ] Refactor
[ ] Target update
[ ] Functionality change
[ ] Docs update
[ ] Test update
[ ] Breaking change

[OPpuolitaival]

Looks good

[cmonr]

/morph build

[mbed-ci]

Build : SUCCESS

Build number : 3521
Build artifacts/logs : http://mbed-os.s3-website-eu-west-1.amazonaws.com/?prefix=builds/8588/

Triggering tests

/morph test
/morph export-build
/morph mbed2-build

[mbed-ci]

Exporter Build : SUCCESS

Build number : 3138
Build artifacts/logs : http://mbed-os.s3-website-eu-west-1.amazonaws.com/?prefix=builds/exporter/8588/

[mbed-ci]

Test : FAILURE

Build number : 3305
Test logs :http://mbed-os-logs.s3-website-us-west-1.amazonaws.com/?prefix=logs/8588/3305

[cmonr]

/morph test

[mbed-ci]

Test : SUCCESS

Build number : 3311
Test logs :http://mbed-os-logs.s3-website-us-west-1.amazonaws.com/?prefix=logs/8588/3311