specdep: Switch back to using argparse

Signed-off-by: Euan Harris <euan.harris@citrix.com>
Merge pull request #489 from euanh/specdep-ignore

specdep: Switch back to using argparse
specdep: Fix default value for --dist argument

Signed-off-by: Euan Harris <euan.harris@citrix.com>
Merge pull request #490 from euanh/master

specdep: Fix default value for --dist argument
scripts: Remove workarounds needed to support Ubuntu Raring

Signed-off-by: Euan Harris <euan.harris@citrix.com>
Merge pull request #491 from euanh/bye-bye-raring

scripts: Remove workarounds needed to support Ubuntu Raring