Bug 1273691

Description of problem:
Control Panel (itweb-settings.itweb) escapes "=" characters with a backslash "\" in the deployment.plugin.jvm.arguments deployment.properties file value, but this is not un-escaped when used on the resultant command line, so -Dsome.key="somevalue" has no effect due to being passed as -Dsome.key\="somevalue".

Version-Release number of selected component (if applicable):
1.6.1-1.fc22

How reproducible:
Has always been reproduced when I add a JRE property definition to the JVM arguments field on the JVM Settings page in the IcedTea-Web Control Panel.  If I manually edit the deployment.properties file to ensure equals signs are not escaped, then the problem is not evident in the next browser session, but simply opening and closing the Control Panel will re-insert the backslash escaping, which elicits the problem in the following browser session.

Steps to Reproduce:
1. Open the IcedTea-Web Control Panel
2. Enter a JRE property definition such as -Ddummy.property="value"
3. Start a new browser session
4. Navigate to a URL that uses the Java plugin
5. Check the process list for the actual argument list passed to the JRE (e.g. ps x | grep "java .*plugin")

Actual results:
The -D property definition argument contains an escaped equals sign: "\="

Expected results:
The -D property definition argument contains an un-escaped equals sign: "="

Additional info:
The fact that this can be worked around, by manually editing the deployment.properties file to remove the backslash "\" before the equals sign, suggests that the escaping of equals signs in values is not essential for correctly reading values back from the file.  So the problem definition could alternatively read, "Equal signs in deployment.properties values should not be escaped", unless there is some important reason (security or otherwise) for escaping them.