Enable Datafile Collector FTPS tests

Refactor tests to decrease repetition of same code

Issue-ID: DCAEGEN2-2367
Signed-off-by: Remigiusz Janeczek <remigiusz.janeczek@nokia.com>
Change-Id: I0c6a8cdd8ebf2fd2f9c0d2632ede6e585e40420c
diff --git a/tests/dcaegen2-collectors-datafile/resources/common-keywords.robot b/tests/dcaegen2-collectors-datafile/resources/common-keywords.robot
index 76dc033..a36833e 100644
--- a/tests/dcaegen2-collectors-datafile/resources/common-keywords.robot
+++ b/tests/dcaegen2-collectors-datafile/resources/common-keywords.robot
@@ -37,4 +37,10 @@
 	[Documentation]				Verify that the size of the downloaded data volume is equal to a target value
 	[Arguments]            		${target_ctr_value}
     ${resp}=					Run Process     ${CLI_DR_REDIR_SIM_DOWNLOADED_VOLUME}  shell=yes
-    Should Be Equal As Strings  ${resp.stdout}  ${target_ctr_value}
\ No newline at end of file
+    Should Be Equal As Strings  ${resp.stdout}  ${target_ctr_value}
+
+Start DFC
+	[Documentation]				Start DFC container
+	${cli_cmd_output}=          Run Process                    ${DFC_ROOT}/dfc-start.sh   cwd=${DFC_ROOT}   env:SIMGROUP_ROOT=${SIMGROUP_ROOT}
+    Log To Console              Dfc-start:
+    Log To Console              ${cli_cmd_output.stdout} ${cli_cmd_output.stderr}