intel / govmm / 224

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Pull #64

travis-ci

qemu/qmp: preparation for s390x support

This PR prepares for the s390x support. It introduces:
 - a generalization of ccw and pci devices. The variables for the pci devices
   have been renamed by removing the Pci suffix. They have been moved to the
   qemu_arch_base.go
 - the mapping isVirtioPCI has been move to qemu_arch_base.go because in
   this way a different mapping can be added for other architecture (e.g
   s390x)
 - the functions QemuNetdevParam and QemuDeviceParam have been moved to
   qemu_arch_base.go. In this way, they could be reimplemented for other
   architecture for the case VHOSTUSER
 - a function disableModern has been introduced to check if the device is
   a pci device and then returns the right parameters. In the case of ccw
   devices, they don't have the disable-modern flag
 - a function mqParameter has been introduced to return the right
   parameters for the mq case. The virtio-net-ccw device doesn't have the
   vectors flag
 - in qemu_arch_base_test.go contains the test and strings that can be
   overwritten for other architectures (e.g s390). The devices names and
   the flags for the devices can be overwritten.
 - the string for the romfile has been replaced by a variable romfile
   that could be left empty if the devices doesn't support a romfile as
   for the ccw devices for s390.
 - clean-up: the disable-modern=on/off options have been changed to
   disable-modern=true/false. In the code there was a mixture of on/true
   off/false

Fixes: #61

Co-authored-by: Yash D Jain <ydjainopensource@gmail.com>
Signed-off-by: Alice Frosi <afrosi@de.ibm.com>

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