allow = sign in the parameter value with ss-execute --parameters

[konstan]

$ ss-execute --parameters='a:b=a=b' a/b
Usage: usage: ss-execute [options] <module-url>

<module-uri>    Full URL to the module to execute.
                For example Public/Tutorials/HelloWorld/client_server

ss-execute: error: Invalid parameter key/value pair: a:b=a=b