Voicemail : Redundant value boxnumber is removed

Voicemail : boxnumber under extension{i} was redundant and is removed.

Earlier "config_foreach configure_voicemail extension" was used , which added 4(one for each call) instances of "VoiceMailMain" in extensions.conf.Since we can get value of voice_mail_enable from line ,using line to check value of voice_mail_enable.

Voice mail deposit and retrieve is tested. With multiple line changing voice_mail_enable (1/0 )functionality is tested.

assigned to @Yalu

added 5 commits

• d2051512...6b678c7a - 3 commits from branch devel
• cd5656d8 - voicemail : Redundant value boxnumber is removed
• a2f4d7a1 - Merge branch 'voicemail_fix' of dev.iopsys.eu:feed/openwrt-telephony into voicemail_fix

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added 1 commit

• 4e60578e - Corrected name of field in Line

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merged