Search the PATH and XCP_PATH for filenames specified by a relative path

The lsb init functions reset the PATH, preventing us finding executables in
places like /usr/lib/xen/bin. Now the init.d script can set the XCP_PATH to
bypass this problem.

Signed-off-by: David Scott <dave.scott@eu.citrix.com>
Release 0.9.14

Signed-off-by: David Scott <dave.scott@eu.citrix.com>
Regenerate OASIS

Signed-off-by: David Scott <dave.scott@eu.citrix.com>
Merge pull request #17 from djs55/search-xcp-path

Search XCP_PATH as well as PATH