ID:376 - Add means to configure "Bad Password Threshold"

Add support for setting and printing of the "Bad Password Threshold"
LAN configuration parameter.

Hook ipmi_set_alert_enable() to _ipmi_*()

Commit hooks ipmi_set_alert_enable() to _ipmi_*() functions and is sort of
rewrite of that function with the same functionality.

Rewrite ipmi_set_channel_access()

Commit is a rewrite of ipmi_set_channel_access(). Function utilizes _ipmi_*()
functions now in order to avoid code repetition. Other than that, functionality
should

Rewrite ipmi_set_channel_access()

Commit is a rewrite of ipmi_set_channel_access(). Function utilizes _ipmi_*()
functions now in order to avoid code repetition. Other than that, functionality
should remain the same.

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Hook ipmi_set_user_access() to _ipmi_set_user_access()

Commit hooks ipmi_set_user_access() to _ipmi_set_user_access() and removes
duplicate code.

Hook ipmi_lan_set_password() to _ipmi_set_user_password()

Commit hooks ipmi_lan_set_password() to _ipmi_set_user_password() in order to
get rid off code duplication.

Cleanup formatting in ipmi_lan_set_vlan_id() and ipmi_lan_set_vlan_priority()

Fix typo vlan->VLAN in ipmi_lan_set_vlan_id() and ipmi_lan_set_vlan_priority()

Add limits check in get_cmdline_macaddr()

Commit adds range check prior to cast down to uint8_t. Also, adds a bit of help
text about get_cmdline_macaddr().

Move all help texts into their own functions in ipmi_lanp.c

Commit moves all help texts into their own functions in order to unclutter code
a bit.

Add bunch of TODO marks in ipmi_lanp.c

ID:355 - Fix formatting warning in get_cmdline_ipaddr()

Commit also adds validation prior casting down to uint8_t.

Replace deprecated bzero() with memset()

Commit replaces deprecated bzero() with memset().

Move all files one level up in the file hierarcy, to avoid the useless ipmitool directory.