Fixed logic error occuring at certain values

Fixed logic error occuring at certain values

When the "Wait For Getter Error Or Safe Stateful Validator
Consecutive Success" keyword receives certain arguments, it
will crash with a "Logic error" because the calculated repeat
count will be less than 1 or even 2.

WaitUtilsTest.robot: a new test case Timeout_Hits_Off_By_One_Bug added.

In WaitUtils.robot for keywords:
Wait_For_Getter_And_Safe_Stateful_Validator_Consecutive_Success,

Wait_For_Getter_Error_Or_Safe_Stateful_Validator_Consecutive_Success
changed:
: FOR    ${try}    IN RANGE    1    ${maximum_tries}+1    # If maximum_tries is 3, for will go through 1, 2, and 3.
to
: FOR    ${try}    IN RANGE    1    ${maximum_sleeps}+2    # If maximum_sleeps is 2, for will go through 1, 2, and 3.

Change-Id: Ie924cbd22dad01abf0e3ab9d06c2843abfcfda86
Signed-off-by: Jozef Behran <jbehran@cisco.com>
Signed-off-by: lbuckuli <lbuckuli@cisco.com>