add ( experimental ) support for wildcards in Easystack

[deniskristak]

related to: easystack file pull request
Add support for wildcards when specifying software of toolchain version.

Easystack with wildcards:

software:
  binutils:
    toolchains:
      GCCcore-4.9.3:
        versions:
          *

should find all matching easyconfigs for specified toolchain and software and proceed with them