[RHSSO-2238] Modify the escape_sed_rhs_interpolated_characters() routine to to properly handle partially/fully escaped input string

[iankko]

[RHSSO-2238] Modify the escape_sed_rhs_interpolated_characters()
routine to properly handle the case when its specified input string
is already partially (or fully) escaped

Signed-off-by: Jan Lieskovsky <jlieskov@redhat.com>

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[iankko]

Notes about testing:

Candidate RH-SSO container image containing this change can be found in the container pipeline #617 run.

Steps To Reproduce the Original Issue / Verify the Fix:

Run the image with the ENABLE_ACCESS_LOG env var set to true. On unfixed image it will report error like the following one and fail to boot properly:

Current Result:

$ docker run -e SSO_ADMIN_USERNAME=admin -e SSO_ADMIN_PASSWORD=doesntmatter -e ENABLE_ACCESS_LOG=true registry.redhat.io/rh-sso-7/sso75-openshift-rhel8:7.5-33
...
08:00:13,374 INFO  [org.wildfly.security] (ServerService Thread Pool -- 30) ELY00001: WildFly Elytron version 1.15.13.Final-redhat-00001
08:00:13,965 ERROR [org.jboss.as.controller] (Controller Boot Thread) 

OPVDX001: Validation error in standalone-openshift.xml -------------------------
|
|  628:     <host name="default-host" alias="localhost">
|  629:         <location name="/" handler="sso-welcome-content"/>
|  630:         <access-log use-server-log="true" pattern="%h %l %u %t %{i,X-Forwarded-Host} \<!-- ##ACCESS_LOG_VALVE## -->quot;%r\<!-- ##ACCESS_LOG_VALVE## -->quot; %s %b"/>
|                                                                                             ^^^^ Unexpected character '<' (code 60) in attribute value
|
|  631:         <http-invoker security-realm="ApplicationRealm"/>
|  632:     </host>
|  633: </server>
|
| The primary underlying error message was:
| > Unexpected character '<' (code 60) in attribute value
| >  at [row,col {unknown-source}]: [630,99]
|
|-------------------------------------------------------------------------------

08:00:13,966 ERROR [org.jboss.as.server] (Controller Boot Thread) WFLYSRV0055: Caught exception during boot: org.jboss.as.controller.persistence.ConfigurationPersistenceException: WFLYCTL0085: Failed to parse configuration
	at org.jboss.as.controller@15.0.15.Final-redhat-00001//org.jboss.as.controller.persistence.XmlConfigurationPersister.load(XmlConfigurationPersister.java:143)
	at org.jboss.as.server@15.0.15.Final-redhat-00001//org.jboss.as.server.ServerService.boot(ServerService.java:408)
	at org.jboss.as.controller@15.0.15.Final-redhat-00001//org.jboss.as.controller.AbstractControllerService$1.run(AbstractControllerService.java:447)
	at java.base/java.lang.Thread.run(Thread.java:829)

08:00:13,967 FATAL [org.jboss.as.server] (Controller Boot Thread) WFLYSRV0056: Server boot has failed in an unrecoverable manner; exiting. See previous messages for details.
08:00:13,977 INFO  [org.jboss.as] (MSC service thread 1-2) WFLYSRV0050: WildFly Core 15.0.15.Final-redhat-00001 stopped in 6ms

Expected Result:
While with the corrected image, there will be no error & the image boots properly.

[iankko]

@drichtarik Thx for the prompt review!