fvp_utils.sh: support Monitor LAVA Test actions

Monitor test actions [1] are useful to define multiple expect matches
through regular expressions and can work together with the current
interactive test actions [2], the latter commonly used for single
expect matches and interaction with the booted model.

The change implied a complete refactor of current defined expect
strings, where now these must define whether is a interactive or
monitor test action through a leading char: 'i' for interactive or 'm'
for monitor.

To provide an short example, if we define the following lava expect script

    expect_string+=('m;Booting Trusted Firmware;\
                       Booting BL31;\
                       Digest(\s|\w)*:\s(\w{2}\s){16}@: (\w{2}\s){16}@Event(\s|\w)*:\s\w+\s')

    expect_string+=('i;buildroot login:')

The CI processes it and converts it into the LAVA job definition [3]:

    .
    .
    - test:
       timeout:
        minutes: 15
       monitors:
       - name: tests
         start: 'Booting Trusted Firmware'
         end: 'Booting BL31'
         pattern: 'Digest(\s|\w)*:\s(\w{2}\s){16}'
         pattern: ': (\w{2}\s){16}'
         pattern: 'Event(\s|\w)*:\s\w+\s'
         fixupdict:
          PASS: pass
          FAIL: fail
    - test:
       timeout:
        minutes: 15
       interactive:
       - name: uart0_0
         prompts: ['buildroot login:']
         script:
         - name: result
           command:

Note that boht type of actions are defined. The lava-expects/README.md
has more information about the details implied on this change.

[1] https://validation.linaro.org/static/docs/v2/monitors.html
[2] https://validation.linaro.org/static/docs/v2/actions-test.html#interactive-test-action
[3] https://tf.validation.linaro.org/scheduler/job/312768

Signed-off-by: Leonardo Sandoval <leonardo.sandoval@linaro.org>
Change-Id: Icc05403abf59f30ded60565b8c942d53a91d3990
diff --git a/lava-expect/tftf_fault.exp b/lava-expect/tftf_fault.exp
index d9bce3a..86561e3 100644
--- a/lava-expect/tftf_fault.exp
+++ b/lava-expect/tftf_fault.exp
@@ -8,5 +8,5 @@
 
 # Expect the test to have set a fault message
 if [ -n "${tftf_fault_msg}" ]; then
-    expect_string+=("${tftf_fault_msg}")
+    expect_string+=("i;${tftf_fault_msg}")
 fi