add Debian as supported platform

[cjdcordeiro]

in https://github.com/slipstream/SlipStreamClient/blob/master/client/src/main/python/slipstream/util.py#L73 , we should also support Debian. Otherwise the "Install Packages" from the components workflow will fail with

Error
ss:abort- Exception with detail: Unsupported platform 'debian' while installing packages. Supported: fedora, redhat, centos, opensuse, sles, ubuntu

[schaubl]

For the package installation part see #353. This one is already fixed.

However there is still one thing to do to fully support Debian:

• Add Debian support in the bootstrap

SlipStreamClient/client/src/main/scripts/slipstream.bootstrap.py

Lines 74 to 110 in 2134c10

	Matrix showing support of different init implementations by different versions of RedHat and Ubuntu.
	systemd | init.d | upstart
	RedHat <= 6 NO | YES | NO
	RedHat >= 7 YES | YES* | NO
	Ubuntu <= 14.04 NO | YES | YES
	Ubuntu == 14.10 YES** | YES | YES
	Ubuntu >= 15.x YES | YES* | ?
	SUSE <= 11 NO | YES* | ?
	SUSE >= 12 YES | YES* | ?
	* - via redirect to systemd, provided LSB info in init.d file is correct for systemd;
	** - with 'systemd-sysv' package replaces upstart completely or with 'systemd' package
	runs along with upstart;
	? - I don't know (konstan).
	"""
	INITD_RedHat_ver_min_incl_max_excl = ((5,), (7,))
	INITD_Ubuntu_ver_min_incl_max_excl = ((10,), (15,))
	INITD_SUSE_ver_min_incl_max_excl = ((11,), (12,))
	INITD_BASED_DISTROS = dict([('CentOS', INITD_RedHat_ver_min_incl_max_excl),
	('CentOS Linux', INITD_RedHat_ver_min_incl_max_excl),
	('RedHat', INITD_RedHat_ver_min_incl_max_excl),
	('openSUSE', INITD_SUSE_ver_min_incl_max_excl),
	('SUSE Linux Enterprise Server', INITD_SUSE_ver_min_incl_max_excl),
	('SUSE Linux Enterprise Desktop', INITD_SUSE_ver_min_incl_max_excl),
	('Ubuntu', INITD_Ubuntu_ver_min_incl_max_excl)])
	SYSTEMD_RedHat_ver_min_incl_max_excl = ((7,), (8,))
	SYSTEMD_Ubuntu_ver_min_incl_max_excl = ((15,), (17,))
	SYSTEMD_openSUSE_ver_min_incl_max_excl = ((12,), (14,))
	SYSTEMD_SUSE_ver_min_incl_max_excl = ((12,), (13,))
	SYSTEMD_BASED_DISTROS = dict([('CentOS', SYSTEMD_RedHat_ver_min_incl_max_excl),
	('CentOS Linux', SYSTEMD_RedHat_ver_min_incl_max_excl),
	('RedHat', SYSTEMD_RedHat_ver_min_incl_max_excl),
	('openSUSE', SYSTEMD_openSUSE_ver_min_incl_max_excl),
	('SUSE Linux Enterprise Server', SYSTEMD_SUSE_ver_min_incl_max_excl),
	('SUSE Linux Enterprise Desktop', SYSTEMD_SUSE_ver_min_incl_max_excl),
	('Ubuntu', SYSTEMD_Ubuntu_ver_min_incl_max_excl)])