Clean data when switching tell-base protocol.

Clean data when switching tell-base protocol.

That is to make sure persisted data does not create failures.
That can be reverted when suite results are stable enough.

SSHKeywords.Run_Keyword_With_Ssh added to be more defensive
against situation when inner failure prevents session restore.

ClusterManagement.Check_Bash_Command_On_List_Or_All added
to rely on this defensivenes when running bash commands
with logging and checks.

Change-Id: I9ac004324f06646aec582987cd4665a61db88b4f
Signed-off-by: Vratko Polak <vrpolak@cisco.com>