fix greentea-client, require a character input between K-V pairs

[jamesbeyond]

Description

Currently, greentea-client require a character input in between 2 K-V pair sync commands.
e.g. between {{__sync;1234}} and {{base_time;0}} in a time drifting test.

This is becasue greentea-client didn't reset the LastChar after it receives "tok_close".
The problem didn't got expose before, becasue in mbedhtrun side, it always insert a line feed "\n" in between any 2 K-V pairs.

in the serial connection, that works fine, cancel out the issue.
However, working with Fast Models, specially in windows enviroment, which use telnet as UART. It which use "\r\n" to flush the buffer, this is causing a problem.

So the fix is to reset "LastChar" after received "tok_close"

Pull request type

[x] Fix
[ ] Refactor
[ ] New target
[ ] Feature
[ ] Breaking change

[bridadan]

@mazimkhan any chance you're more familiar with this part of the greentea-client?

[mazimkhan]

Looks good. While we are here can you please fix the indentation of this if block.

[mazimkhan]

@mazimkhan any chance you're more familiar with this part of the greentea-client?

Sorry for the late reply. The change is good.

[0xc0170]

Can you update the commit message (contains info from the description - useful info). Plus the first line should be within 50 characters as stated in our guidelines (avoid wrapping, can be seen here on github as well)

[0xc0170]

LGTM the changes

requesting commit msg update

[jamesbeyond]

@0xc0170, Hi Martin, the commit message had been changed

Changes addressed

[bridadan]

I think it'll be ok, running it through the CI tests should catch any issues.

[cmonr]

/morph build

[mbed-ci]

Build : SUCCESS

Build number : 2010
Build artifacts/logs : http://mbed-os.s3-website-eu-west-1.amazonaws.com/?prefix=builds/6865/

Triggering tests

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

[mbed-ci]

Test : SUCCESS

Build number : 1820
Test logs :http://mbed-os-logs.s3-website-us-west-1.amazonaws.com/?prefix=logs/6865/1820

[mbed-ci]

Exporter Build : SUCCESS

Build number : 1662
Build artifacts/logs : http://mbed-os.s3-website-eu-west-1.amazonaws.com/?prefix=builds/exporter/6865/